(1225 + 625) - 4x = 1000 - 150
=> 1850 - 4x = 950
=> 4x = 1850 - 950
=> 4x = 900
=> x = 900 : 4
=> x = 225
b) 43 - (24 - x) = 20
=> 24 - x = 43 - 20
=> 24 - x = 23
=> x = 24 - 23
=> x = 1
c) 245 - 5(16 + x) = 140
=> 5(16 + x) = 245 - 140
=> 5(16 + x) = 105
=> 16 + x = 105 : 5
=> 16 + x = 21
=> x = 21 - 16
=> x = 5
\(a,\)\(\left(1225+625\right)-4x=1000-150.\)
\(\Rightarrow1850-4x=850\)\(\Rightarrow4x=1850-850=1000\)
\(b,43-\left(24-x\right)=20\)
\(\Rightarrow43-24+x=20\)\(\Rightarrow19+x=20\Leftrightarrow x=1\)
\(c,245-5\left(16+x\right)=140\)
\(\Rightarrow245-80-5x=140\)
\(\Rightarrow165-5x=140\Leftrightarrow5x=165-140=25\Leftrightarrow x=5\)
1,(1225+625)-4x=1000-150
1850-4x=850
4x=1850-850
4x=1000
x = 1000:4 =250
2,43-(24-x)=20
24-x = 43-20
24x = 23
x = 23:24 =\(\frac{23}{24}\)
\(\left(1225+625\right)-4x=1000-150\Leftrightarrow1850-4x=850\)
\(\Leftrightarrow4x=1850-850=1000\)
\(\Rightarrow x=\frac{1000}{4}=250\)
\(43-\left(24-x\right)=20\Leftrightarrow24-x=43-20\)
\(24-x=23\Rightarrow x=24-23=1\)
\(245-5\left(16+x\right)=140\)
\(\Leftrightarrow5\left(16+x\right)=245-140\)
\(\Leftrightarrow5\left(16+x\right)=105\)
\(\Leftrightarrow16+x=\frac{105}{5}\)
\(\Leftrightarrow16+x=21\)
\(\Rightarrow x=21-16=5\)
(1225+625) -4x= 1000-150
(1225+625)-4x=850
1850- 4x= 850
4x= 1850-850
4x= 1000
X= 1000;4
X=250
2,245-5(16+x)=140
5(16+x)=245-140
5(16+x)=105
16+x=105:5
16+x=21
x=21-16=5
k cho mk nhé:))
( 1225 + 625 ) - 4x = 1000 - 150
1850 - 4x = 850
4x = 1850 - 850
4x = 1000
x = 1000 : 4
Vậy x = 250
43 - ( 24 - x ) = 20
24 - x = 43 - 20
24 - x = 23
x = 24 - 23
Vậy x = 1
245 - 5 ( 16 + x ) = 140
5 ( 16 + x ) = 245 - 140
5 ( 16 + x ) = 105
16 + x = 105 : 5
16 + x = 21
x = 21 - 16
Vậy x = 5