a) ( x – 30 ) : 2 = 3
b) 2 . ( x – 30 ) = 8
c) 70 – 2x = 40
d) 70 +2 : x = 80
e) 70 : 2x = 105
g) ( x – 30 ) :2 = 8
a) ( x – 30 ) : 2 = 3 b) 2 . ( x – 30 ) = 8 c) 70 – 2x = 40 d) 70 +2 : x = 80 e) 70 : 2x = 105 g) ( x – 30 ) :2 = 8
By Genesis
By Genesis
a) ( x – 30 ) : 2 = 3
b) 2 . ( x – 30 ) = 8
c) 70 – 2x = 40
d) 70 +2 : x = 80
e) 70 : 2x = 105
g) ( x – 30 ) :2 = 8
Đáp án:
Giải thích các bước giải:
a) `( x – 30 ) : 2 = 3`
`⇔ x-30=6`
`⇔ x=36`
Vậy `x=36`
b) `2 . ( x – 30 ) = 8`
`⇔ x-30=4`
`⇔ x=34`
Vậy `x=34`
c) `70 – 2x = 40`
`⇔ 2x=30`
`⇔ x=15`
Vậy `x=15`
d) `70 +2 : x = 80`
`⇔ 2:x=10`
`⇔ x=\frac{1}{5}`
Vậy `x=1/5`
e) `70 : 2x = 105`
`⇔ 2x=2/3`
`⇔ x=1/3`
Vậy `x=1/3`
g) `( x – 30 ) :2 = 8`
`⇔ x-30=16`
`⇔ x=46`
Vậy `x=46`
a) ( x – 30 ) : 2 = 3
x – 30 =6
x = 6+30
x = 36
b) 2 . ( x – 30 ) = 8
x – 30 =8:2
x – 30 =4
x = 34
c)70 – 2x = 40
2x =70-40
2x=30
x = 30:2
x=15
d) 70 +2 : x = 80
2 😡 = 80 – 70
2:x = 10
x = 10.2
x =20
e) 70 : 2x = 105
2x=2/3
x = 2/3 :2
x = 1/3
g) ( x – 30 ) :2 = 8
x – 30 = 8.2
x – 30 = 16
x = 30+16
x = 46
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