# Operasi Aljabar (Kls.7)

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| By AndreasRusdiTure
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AndreasRusdiTure
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Quizzes Created: 6 | Total Attempts: 21,389
Questions: 10 | Attempts: 10,725

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Kerjakanlah operasi aljabar di bawah ini dengan memilih jawaban yang paling benar!

• 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

B. Ab + 3a + 2b
Explanation
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.

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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

B. 2x - 14
Explanation
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.

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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

C. 7a + 3b
Explanation
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.

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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)

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).

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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

D. 2ab - 5ac
Explanation
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.

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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

D. 5x - 7
Explanation
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.

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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

B. -7x - 15
Explanation
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.

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• 8.

### Nilai ayang memenuhi : 3(a + 4) = 4(a + 5) adalah ... .

• A.

-10

• B.

-8

• C.

8

• D.

10

B. -8
Explanation
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.

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• 9.

### Nilai p yang memenuhi : 2(p - 4) = 4(p - 1) adalah ... .

• A.

-4

• B.

-2

• C.

2

• D.

4

B. -2
Explanation
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.

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• 10.

• A.

-11

• B.

-5

• C.

5

• D.

11