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\(e,\left(x-2\right).3-270:45=120\)
\(\Rightarrow\left(x-2\right).3-6=120\)
\(\Rightarrow\left(x-2\right).3=126\)
\(\Rightarrow x-2=42\)
\(\Rightarrow x=44\)
Bài làm
a) 16 . 34 + 66 . 16 - 72
= 16 . ( 34 + 16 ) - 72
= 16 . 80 - 72
= 1280 - 72
= 1208
b) 4,25 . 58,47 + 125 + 41,53 . 4,25
= 4,25 . ( 58,47 + 41,53 ) + 125
= 4,25 . 100 + 125
= 425 + 125
= 550
c) x : 15 + 42 = 15 + 25 . 8
x : 15 + 42 = 15 + 200
x : 15 + 42 = 215
x : 15 = 215 - 42
x : 15 = 173
x = 173 . 15
x = 188
Vậy x = 188
~ Hai câu cuối làm nốt nha, hết thời gian cho một câu hỏi r. ~
# Học tốt #
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\(\left(x-2\right)\times3-270:45=120\)
\(\Rightarrow\left(x-2\right)\times3-6=120\)
\(\Rightarrow\left(x-2\right)\times3=120+6\)
\(\Rightarrow\left(x-2\right)\times3=126\)
\(\Rightarrow x-2=126:3\)
\(\Rightarrow x-2=42\)
\(\Rightarrow x=42+2\)
\(\Rightarrow x=44\)
Vậy x = 44
_Chúc bạn học tốt_
\(\left(x-2\right)\cdot3-270:45=120\)
\(\left(x-2\right)\cdot3-6=120\)
\(\left(x-2\right)\cdot3=120+6\)
\(\left(x-2\right)\cdot3=126\)
\(x-2=42\)
\(x=44\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(x-2\right).3-6=120\Leftrightarrow\left(x-2\right).3=126\Leftrightarrow x-2=42\Leftrightarrow x=44\)
![](https://rs.olm.vn/images/avt/0.png?1311)
bài 2 tìm x
a,106- ( x+ 7) =9
x+7 = 106 - 9
x+7 = 107
x= 107 - 7
x=100
b, 2 x ( x+ 4) + 5 =65
2 x (x+4) = 65 - 5
2 x (x+4) = 60
x+4 = 60:2
x+4= 30
x= 30 - 4
x=26
c, (16x x -32) x 45=0
16 x X - 32 = 0: 45
16 x X - 32 =0
16 x X = 0 + 32
16 x X = 32
X= 32:16
X=2
d, x+4 x x = 100 : 5
X + 4 x X = 20
(1+4) x X = 20
5 x X = 20
X= 20:5
X=4
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(2009-x\right):29+32=100\\ =>\left(2009-x\right):29=100-32=68\\ =>2009-x=68.29=1972\\ =>x=2009-1972=37\)
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\(\left(x-2\right).3-270:45=120\\ =>3\left(x-2\right)-6=120\\ =>3\left(x-2\right)=120+6=126\\ =>x-2=126:3=42\\ =>x=42+2=44\)