làm nhanh mik tik cho lên SP và GP
a) \(x\times17,7-7,7\times x=177\)
\(x\times\left(17,7-7,7\right)=177\)
\(x\times10=177\)
\(x=177:10\)
\(x=17,7\)
b) \(9\times\left(12-2\times x\right)=54\)
\(12-2\times x=54:9\)
\(12-2\times x=6\)
\(2\times x=12:6\)
\(2\times x=2\)
\(x=2:2\)
\(x=1\)
c) \(x\times3,9+x\times0,1=16\)
\(x\times\left(3,9+0,1\right)=16\)
\(x\times4=16\)
\(x=16:4\)
\(x=4\)
d) \(1,23:x-0,45:x=1,5\)
\(x:\left(1,23-0,45\right)=1,5\)
\(x:0,78=1,5\)
\(x=1,5\times0,78\)
\(x=1,17\)
e) \(\dfrac{17}{5}:x=\dfrac{34}{5}:\dfrac{4}{3}\)
\(\dfrac{17}{5}:x=\dfrac{51}{10}\)
\(x=\dfrac{51}{10}:\dfrac{17}{5}\)
\(x=\dfrac{3}{2}\)
a) x×17,7−7,7×x=177
x×(17,7−7,7)=177
x×10=177
x=177:10
x=17,7
b) 9×(12−2×x)=54
12−2×x=54:9
12−2×x=6
2×x=12:6
2×x=2
x=2:2x=2:2
x=1
c) x×3,9+x×0,1=16
x×(3,9+0,1)=16
x×4=16
x=16:4
x=4x=4
d) 1,23:x−0,45:x=1,5
x:(1,23−0,45)=1,5
x:0,78=1,5
x=1,5×0,78
x=1,17
