X : 30 + 215 x 125 = 59375
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a) 5.(x-20) = 35
(x-20) = 35:5
x-20 = 7
x = 27
b) (x+125) -301 = 56
x+125 -301 = 56
x - 176 = 56
x = 56 +176
x= 232
c) 215 + (x-21):2 = 235
(x-21):2 = 235 - 215
(x-21):2 = 20
x-21 = 20 .2
x-21 = 40
x = 61
d) (x:23 +45) .67 = 8911
(x:23 +45) = 8911 : 67
x:23+45 = 133
x:23 = 133-45
x:23 = 88
x = 88.23
x = 2024
a) 5.(x - 20) = 35
⇒ x - 20 = 35 : 5
⇒ x - 20 = 7
⇒ x = 7 + 20
⇒ x = 27
b) (x + 125) - 301 = 56
⇒ x + 125 = 56 + 301
⇒ x + 125 = 357
⇒ x = 357 - 125
⇒ x = 232
c) 215 + (x - 21) : 2 = 235
⇒ (x - 21) : 2 = 235 - 215
⇒ (x - 21) : 2 = 20
⇒ x - 21 = 20 x 2
⇒ x - 21 = 40
⇒ x = 21 + 40
⇒ x = 61
d) (x : 23 + 45).67 = 8911
⇒ x : 23 + 45 = 8911 : 67
⇒ x : 23 + 45 = 133
⇒ x : 23 = 133 - 45
⇒ x : 23 = 88
⇒ x = 88 x 23
⇒ x = 2024
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a) 5.x< 40
=> x = 0 ; 1 ; 2 ; 3 ; 4 ; 5 ; 6 ; 7
b)5(x-20)=35
= ( x - 20 ) = 35 : 5 = 7
( x - 20 ) = 7
=>x = 20 + 7 = 27
c) (x-125)-130=5
( x - 125 ) = 5 + 130
( x - 125 ) = 135
=>x = 135 + 125
= 360
d)215+(x+21):2=358
( x + 21 ) : 2 = 358 - 215
( x +2 1 ) : 2 = 170
( x + 21 ) = 170 x 2 = 340
( x + 21 ) = 340 - 21 = 319
![](https://rs.olm.vn/images/avt/0.png?1311)
d) 215 + ( x - 21 ) : 2 = 235
215 + ( x - 21 ) = 235 . 2
215 + ( x - 21 ) = 470
x - 21 = 470 - 215
x - 21 = 255
x = 255 + 21
x = 276
các bài còn lại làm tương tự nhé
nó dài lắm mik
nhớ ủng hộ mik nhé
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4057+(X:38) = 20395
X:38 = 20395-4057
X:38= 16338
X=16338 x 38
X= 620844
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125-(30+x+125)=(x-237).[8+(-237)]
125-(30+x+125)=(x-237)×(-229)
125-(30+x+125)=x-237×(-229)
125-(30+x+125)=x-(-54273)
125-(30+x+125)=x+54273
125-30+x+125=x+54273
125-39+x=x+54273-125
125-39+x=x+54148
125-x=x+54148-39
125-x=x+54109
125-1x=1x+54109
125-1x=0
1x=125-0
1x=125
x=125÷1
x=125
\(x:30+215\times125=59375\)
\(x:30+26875=59375\)
\(x:30=32500\)
\(x=975000\)
`x : 30 + 215 xx 125 = 59375`
`=> x : 30 + 26875 = 59375`
`=> x : 30 = 59375 - 26875`
`=> x : 30 = 32500`
`=>x = 32500xx30`
`=> x = 975000`