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222-9+11+12:2*14+14 = ? ( )

## Toán Lớp 5: a, x x 25,6 = 128 b, 17,8 x x = 360,05 – 9.,05 c, 29,5 x ( x + 10,25) = 376,125 d, 748 : ( x – 31,72) =13,6

Toán Lớp 5: a, x x 25,6 = 128
b, 17,8 x x = 360,05 – 9.,05
c, 29,5 x ( x + 10,25) = 376,125
d, 748 : ( x – 31,72) =13,6

1. a,
x xx 25,6 = 128
x=128 : 25,6
x=5
______________________
b,
17,8 xx x = 360,05 – 9,05
17,8 xx x = 351
x=351:17,8
x=19,7191
__________________________
c,
29,5 xx (x+10,25) = 376,125
x+10,25 = 376,125 : 29,5
x+10,25=12,75
x=12,75-10,25
x=2,5
_____________________________
d,
748 : (x-31,72) = 13,6
x-31,72=784:13,6
x-31,72=55
x=55+31,72
x=86,72

2. $\text{a) x × 25,6 = 128}$
$\text{x = 128 : 25,6 }$
$\text{x = 5}$
$\text{b) 17,8 × x = 360,05 – 9,05}$
$\text{17,8 × x = 351}$
$\text{ x = 351 : 17,8}$
$\text{x = 19,7191}$
$\text{c) 29,5 × ( x + 10,25 ) = 376,125}$
$\text{x + 10,25 = 376,125 : 29,5}$
$\text{x + 10,25 = 12,75}$
$\text{x = 12,75 – 10,25}$
$\text{ x = 2,5}$
$\text{d) 748 : ( x – 31,72 ) = 13,6}$
$\text{ x – 31,72 = 748 : 13,6}$
$\text{x – 31,72 = 55}$
$\text{ x = 55 + 31,72}$
$\text{x = 86,72}$
$\text{Xin hay nhất và 5 sao ạ}$