## a, 457+(217-x)=589 b,96-3(x+1)=42 c,5.(x+35)=515 d,70-5(x-3)=45 e,10+2.x=4 mũ 5: 4 mũ 3

Question

a, 457+(217-x)=589
b,96-3(x+1)=42
c,5.(x+35)=515
d,70-5(x-3)=45
e,10+2.x=4 mũ 5: 4 mũ 3

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2 tuần 2021-07-07T15:04:00+00:00 2 Answers 4 views 0

1. Đáp án:

bn tham khảo ko hiểu cứ nói nhé

Giải thích các bước giải:

a) 457 + (217 – x) = 589

=> 217 – x = 589 – 457

=> 217 – x = 132

=> x = 217 – 132

=> x = 85

b) 96 – 3(x + 1) = 42

=> 3(x + 1) = 96 – 42

=> 3(x + 1) = 54

=> x + 1 = 18

=> x = 18 – 1 = 17

c) 5(x + 35) = 515

=> x + 35 = 515 : 5

=> x + 35 = 103

=> x = 103 – 35 = 68

d) 70 – 5(x – 3) = 45

=> 5(x – 3) = 70 – 45

=> 5(x – 3) = 25

=> x – 3 = 5

=> x = 5 + 3 = 8

e) 10 + 2 . x = 4^5 : 4^3

=> 10 + 2 . x = 4^2

=> 2 . x = 4^2 – 10

=> 2 . x = 6

=> x = 3

\text{HỌC TỐT. NOCOPY}

2. a, 457 + ( 217 – x ) = 589

217 – x = 589 – 457

217 – x = 132

x = 217 – 132

x = 85

b, 96 – 3( x + 1 ) = 42

3( x + 1 ) = 96 – 42

3( x + 1 ) = 54

x + 1 = 54 : 3

x + 1 = 18

x = 18 – 1

x = 17

c, 5 . ( x + 35 ) = 515

x + 35 = 515 : 5

x + 35 = 103

x = 103 – 35

x = 68

d, 70 – 5(x-3) = 45

5(x-3) = 70 – 45

5(x-3) = 25

x – 3 = 25 : 5

x – 3 = 5

x = 5 + 3

x = 8

e, 10 + 2x = 4^5 : 4^3

10 + 2x = 16

2x = 16 – 10

2x = 6

x = 3.