Operasi Aljabar (Kls.7)
- 1.
Bentuk sederhana dari : 5ab + 8a - 4ab - 5a + 2b adalah ... .
- A.
9ab - 3a - 2b
- B.
Ab + 3a + 2b
- C.
-ab + 3a + 2b
- D.
Ab + 3a - 2b
Correct Answer
B. Ab + 3a + 2bExplanation
The given expression consists of terms with variables a and b. To simplify the expression, we can combine like terms. The terms 5ab and -4ab can be combined to give ab. The terms 8a and -5a can be combined to give 3a. The terms 2b remain the same. Therefore, the simplified form of the expression is ab + 3a + 2b.Rate this question:
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- 2.
Hasil pengurangan : -2(5x - 1) dari 4 (-2x - 3) adalah ... .
- A.
2x + 14
- B.
2x - 14
- C.
-2x - 14
- D.
14 - 2x
Correct Answer
B. 2x - 14Explanation
The given expression is (-2)(5x - 1) which can be simplified as -10x + 2. Then, this expression is subtracted from 4(-2x - 3), which can be simplified as -8x - 12. Subtracting -10x + 2 from -8x - 12 gives 2x - 14.Rate this question:
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- 3.
Bentuk sederhana dari : 9a + 6b - 2a - 3b adalah ... .
- A.
-7a + 3b
- B.
7a - 3b
- C.
7a + 3b
- D.
-7a - 3b
Correct Answer
C. 7a + 3bExplanation
The given expression is a combination of like terms. The terms 9a and -2a can be combined to give 7a, and the terms 6b and -3b can be combined to give 3b. Therefore, the simplified form of the expression is 7a + 3b.Rate this question:
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- 4.
Nilai dari : 2a(b - 2) + 3(a + 2b) + 3a - 4b adalah ... .
- A.
2(ab - a - b)
- B.
2(ab - a + b)
- C.
2(ab + a + b)
- D.
2(ab + a - b)
Correct Answer
C. 2(ab + a + b)Explanation
The given expression can be simplified by distributing the coefficients. Starting with the first term, 2a(b - 2), we can distribute the 2a to get 2ab - 4a. Moving on to the second term, 3(a + 2b), we can distribute the 3 to get 3a + 6b. Finally, the third term, 3a - 4b, remains the same. Combining all the terms, we have 2ab - 4a + 3a + 6b + 3a - 4b. Simplifying further, we get 2ab + 2a + 2b, which matches the answer choice 2(ab + a + b).Rate this question:
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- 5.
Nilai dari : -2ab - (-3bc) + 4ab - 3bc - 5ac adalah ... .
- A.
2ab + 6bc
- B.
2ab - 6bc
- C.
2ab + 5ac
- D.
2ab - 5ac
Correct Answer
D. 2ab - 5acExplanation
The given expression is simplified by combining like terms. We have -2ab + 3bc + 4ab - 3bc - 5ac. Combining like terms, we get -2ab + 4ab - 5ac. Simplifying further, we have 2ab - 5ac.Rate this question:
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- 6.
Jumlah dari : 2x + 3 dan 3x - 10 adalah ... .
- A.
5 - 7x
- B.
-5x - 7
- C.
5x + 7
- D.
5x - 7
Correct Answer
D. 5x - 7Explanation
The given expression asks for the sum of 2x + 3 and 3x - 10. To find the sum, we combine like terms by adding the coefficients of x and the constants separately. The sum of the x terms is 2x + 3x = 5x, and the sum of the constant terms is 3 + (-10) = -7. Therefore, the correct answer is 5x - 7.Rate this question:
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- 7.
Bentuk sederhana dari : 2(4x + 3) - 3(5x + 7) adalah ... .
- A.
-x + 19
- B.
-7x - 15
- C.
7x + 15
- D.
7x - 15
Correct Answer
B. -7x - 15Explanation
The given expression can be simplified by distributing the coefficients to the terms inside the parentheses. Simplifying the expression gives us -8x - 6 - 15x - 21. Combining like terms, we get -23x - 27. Therefore, the correct answer is -23x - 27, not -7x - 15.Rate this question:
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- 8.
Nilai a yang memenuhi : 3(a + 4) = 4(a + 5) adalah ... .
- A.
-10
- B.
-8
- C.
8
- D.
10
Correct Answer
B. -8Explanation
The correct answer is -8 because when we simplify the equation 3(a + 4) = 4(a + 5), we get 3a + 12 = 4a + 20. By subtracting 3a from both sides, we get 12 = a + 20. Subtracting 20 from both sides, we get -8 = a, which means that a is equal to -8.Rate this question:
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- 9.
Nilai p yang memenuhi : 2(p - 4) = 4(p - 1) adalah ... .
- A.
-4
- B.
-2
- C.
2
- D.
4
Correct Answer
B. -2Explanation
The correct answer is -2 because when we simplify the equation 2(p - 4) = 4(p - 1), we get 2p - 8 = 4p - 4. By rearranging the terms, we have 2p - 4p = -4 + 8, which simplifies to -2p = 4. Dividing both sides by -2, we find that p = -2. Therefore, -2 is the value that satisfies the given equation.Rate this question:
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- 10.
Nilai a yang memenuhi : 8(a + 5) = 3(a - 5) - 6a adalah ... .
- A.
-11
- B.
-5
- C.
5
- D.
11
Correct Answer
B. -5Explanation
The equation given is 8(a + 5) = 3(a - 5) - 6a. To solve this equation, we can start by distributing the 8 and the 3 to the terms inside the parentheses. This gives us 8a + 40 = 3a - 15 - 6a. Next, we can combine like terms by subtracting 3a from both sides and adding 6a to both sides. This simplifies the equation to 5a + 40 = -15. Finally, we can isolate the variable by subtracting 40 from both sides. This gives us 5a = -55. Dividing both sides by 5, we find that a = -11. Therefore, the correct answer is -11.Rate this question:
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Mar 20, 2023Quiz Edited by
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Aug 12, 2012Quiz Created by
AndreasRusdiTure
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