a)15+5x=40 b)10x+65=125
5x=40-15 10x =125-65
5x=25 10x =60
x=25:5 x =60:10
X=5 x =6
b)25+3(x-8)=106 d)4(x+41)=400
3(x-8)=106-25 x+41=400:4
3(x-8)= 81 x+41 =100
x-8=81:3 x =100-41
x-8=27 x =59
x =27+8
x =35
Chúc bạn học giỏi nhé!
à phần c và d là
c)25+3(x-8)=106 d)4(x+41)=400
3(x-8)=106-25 x+41=400:4
3(x-8)= 81 x+41 =100
x-8=81:3 x =100-41
x-8=27 x =59
x =27+8
ó x =35
Lâu lâu làm câu toán
a,15+5x=40
=>5x=25
=>x=5
Vậy x=5
b,10x+65=125
=>10x=60
=>x=6
Vậy x=6
c, 25+3(x-8)=106
=>3x-24=81
=>3x=105
=>x=55
Vậy x=55
d, 4(x+41)=400
=>4x+164=400
=>4x=236
=>x=56
Vậy x=56
a) 15+5x=40
\(\Rightarrow\) 5x = 40 - 15
\(\Rightarrow\) 5x = 25
\(\Rightarrow\) x = 25 : 5
\(\Rightarrow\) x = 5
b) 10x+65=125
\(\Rightarrow\) 10x = 125 - 65
\(\Rightarrow\) 10x = 60
\(\Rightarrow\) x = 60 : 10
\(\Rightarrow\) x = 6
c) 25+3(x-8)=106
\(\Rightarrow\) 3(x - 8) = 106 - 25
\(\Rightarrow\) 3(x - 8) = 81
\(\Rightarrow\) x - 8 = 81 : 3
\(\Rightarrow\) x - 8 = 27
\(\Rightarrow\) x = 27 + 8
\(\Rightarrow\) x = 35
d) 4(x+41)=400
\(\Rightarrow\) x + 41 = 400 : 4
\(\Rightarrow\) x + 41 = 100
\(\Rightarrow\) x = 100 - 41
\(\Rightarrow\) x = 59
