Toán Lớp 6: a) 58 + 7.x = 100
b) 101 +(36 – 4.x) =105
c) 3x – 7 = 28
d) ( x – 12):12=12
e) x – 56 : 4= 16
f) (3.x-24).73=2.74
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Toán Lớp 6: a) 58 + 7.x = 100
b) 101 +(36 – 4.x) =105
c) 3x – 7 = 28
d) ( x – 12):12=12
e) x – 56 : 4= 16
f) (3.x-24).73=2.74
Comments ( 2 )
7.x = 100 – 58
7.x = 42
x = 42 : 7
x = 6
Vậy x = 6
b) 101 +(36-4.x) = 105
(36-4.x) = 105 – 101
36-4.x = 4
4.x = 36-4
4.x = 32
x = 32 : 4
x = 8
Vậy x = 8
c) 3x – 7 = 28
3x = 28 + 7
3x = 35
x = 35 : 3
x = 35
—-
3
vậy x = 35
—
3
d) ( x – 12):12 = 12
( x – 12) = 12 . 12
x – 12 = 144
x = 144 + 12
x = 156
Vậy x = 156
e) x – 56 : 4 = 16
x – 14 = 16
x = 16 + 14
x = 30
Vậy x = 30
f) ( 3.x-24 ) . 73 = 2.74
( 3.x-24 ) . 73 = 148
( 3.x-24 ) = 148 : 73
3.x-24 = 148
——
73
3.x = 148
—— + 24
73
3.x = 1900
——
73
x = 1900
—— : 3
73
x = 1900
—–
219
Vậy x = 1900
——-
219
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