Toán Lớp 6: A. 2016 : [ 25 – ( 3x + 2 ) = 3 mũ 2 . 7
B . 6 x + x = 5 mũ 11 : 5 mũ 9 + 3 ,mũ 1
C . 390 – (x -7) = 196 : 13
D, 8x = 3 mũ 3 . 4 + 12
E , X = 10 = 2021 mũ 10 : 2021 mũ 9
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Toán Lớp 6: A. 2016 : [ 25 – ( 3x + 2 ) = 3 mũ 2 . 7
B . 6 x + x = 5 mũ 11 : 5 mũ 9 + 3 ,mũ 1
C . 390 – (x -7) = 196 : 13
D, 8x = 3 mũ 3 . 4 + 12
E , X = 10 = 2021 mũ 10 : 2021 mũ 9
Comments ( 1 )
A, 2016 : [ 25 – (3x + 2) = 63
25 – (3x + 2) = 32
3x + 2 = – 7
3x = (- 7) – 2
3x = – 9
x = – 9
x = – 9 : 3
x = – 3
⇒ Vậy x = -3
B , 7x = 5^2 + 3
7^x = 28
x = 28 : 7
x = 4
⇒ Vậy x = 4
C , 390 – (x – 7) = 13
x – 7 = 372
x – 7 = 377 + 7
x = 384
⇒ Vậy x = 384
D , 8x = 108 + 12
3x = 120
x = 120 : 8
x = 15
⇒ Vậy x = 15
E , x – 10 = 2021
x = 2021 + 10
x = 2031
⇒ Vậy x = 2031
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