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
Trả lời :
a) \(1,25\times4-x=2,5\)
\(5-x=2,5\)
\(x=5-2,5\)
\(x=2,5\)
~HT~
Trả lời :
b) \(\left(158-x\right)\div7=20\)
\(158-x=20\times7\)
\(158-x=140\)
\(x=158-140\)
\(x=18\)
~HT~
\(c, x-0,25=\frac{43}{4}+\frac{18}{5}\)
\(\Rightarrow x-\frac{1}{4}=\frac{43}{4}+\frac{18}{5}\)
\(\Rightarrow x=\left(\frac{43}{4}+\frac{1}{4}\right)+\frac{18}{5}\)
Tự làm nốt , mình bận rồi
Trả lời :
c) \(x-0,25=\frac{43}{4}+\frac{18}{5}\)
\(x-0,25=\frac{287}{20}\)
\(x-\frac{1}{4}=\frac{287}{20}\)
\(x=\frac{287}{20}+\frac{1}{4}\)
\(x=\frac{73}{5}\)
~HT~