(158-x):7=20
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a) \(128-3\cdot\left(x+4\right)=23\)
\(\Leftrightarrow3\cdot\left(x+4\right)=105\)
\(\Leftrightarrow x+4=35\)
\(\Leftrightarrow x=31\)
b) \(\left(158-x\right):7=20\)
\(\Leftrightarrow158-x=140\)
\(\Leftrightarrow x=18\)
\(a,128-3.\left(x+4\right)=23\)
\(\Rightarrow3.\left(x+4\right)=128-23\)
\(\Rightarrow3.\left(x+4\right)=105\)
\(\Rightarrow\left(x+4\right)=105:3\)
\(\Rightarrow\left(x+4\right)=35\)
\(\Rightarrow x=35-4\)
\(\Rightarrow x=31\)
936 - ( x + 24 ) = 72
936 - x - 24 = 72
912 - x=72
x=840
5 . (x + 35 ) = 515
x+35=515:5
x+35=103
x=68
(158 - x ) :7 = 20
158 - x=20x7
158 - x=140
x=18
936-(x+24)=72
X+24=936-72
X+24=864
X=864-24
X=840
5.(x+35)=515
X+35=515:5
X+35=103
X=103-35
X=68
(158-x):7=20
158-x=20.7
158-x=140
X=158-140=18
K biết đúng hay sai hì hì, mong thông cảm ạ*cúi đầu*
a.
\(1,25\times4-x=2,5\)
\(5-x=2,5\)
\(x=5-2,5\)
\(x=2,5\)
b.
\(\left(158-x\right)\div7=20\)
\(158-x=20\times7\)
\(158-x=140\)
\(x=158-140\)
\(x=18\)
c.
\(x-0,25=\frac{43}{4}-\frac{18}{5}\)
\(x-\frac{1}{4}=\frac{43}{4}-\frac{18}{5}\)
\(x=\frac{43}{4}-\frac{18}{5}+\frac{1}{4}\)
\(x=\left(\frac{43}{4}+\frac{1}{4}\right)-\frac{18}{5}\)
\(x=\frac{44}{4}-\frac{18}{5}\)
\(x=11-\frac{18}{5}\)
\(x=\frac{37}{5}\)
a. 1,25 × 4 - x = 2,5
5- x= 2,5
x= 5-2,5
x=2,5
b.(158- x) :7= 20
158- x= 20x7
158 -x= 140
x=158- 140
x=18
c. x- 0,25= \(\frac{43}{4}+\frac{18}{5}\)
x- 0,25=14,35
x= 14,35+ 0,25
x=14,6
\(\left(158-x\right):7=20\)
\(158-x=20\cdot7\)
\(158-x=140\)
\(x=158-140\)
\(x=18\)
\(231-\left(x-6\right)=\frac{1339}{13}\)
\(231-\left(x-6\right)=103\)
\(231-103=x-6\)
\(x-6=128\)
\(x=134\)
\(\frac{81+2x}{5}=25\)
\(\left(81+2x\right):5=25\)
\(81+2x=25\cdot5\)
\(81+2x=125\)
\(2x=125-81\)
\(2x=44\)
\(x=22\)
1.(158-x):7=20
158-x =20.7
158-x =140
x =158-140
x =18
2.231-(x-6)=1339/13
231-(x-6)=103
x-6=231-103
x-6=128
x =128+6
x =134
3.(81+2.x)/.5=25
81+2.x =25.5
81+2.x =125
2.x =125-81
2.x =44
x =44:2
x =22
k mik nha
( x-2) .3 =18 135-3(x+1)=30
(x-2) =18:3 3(x+1)=135-30
(x-2) =6 3(x+1)=105
x =6+2 x+1 =105:3
x =8 x+1 =35
x =35-1
x =34
(123-x)-72=28 (158-x):7=28
(123-x) =28+72 (158-x) =28.7
(123-x) =100 (158-x) =784
x =123-100 x =158-784
x =23 x =-626
42.x=39.42-37.42
42.x=42.(39-37)
42.x=42.2
x=42.2:42
x =2
bài này dài lắm đó k mik nha
b.(158- x) :7= 20
158- x= 20x7
158 -x= 140
x=158- 140
x=18
( 158 - x ) : 7 = 20
158 - x = 20 x 7
158 - x = 140
x = 158 - 140
x = 18
(158 - x) : 7 = 20
<=> 158 - x = 20.7
<=> 158 - x = 140
<=> x = 158 - 140
<=> x = 18
=> x = 18