Question

Bài 70 tr 20 sbt ạ

3,8:(2x)=\(\frac{1}{4}\):\(2\frac{2}{3}\)

(0,25x):3=\(\frac{5}{6}\):0,125

0,01:2,5=(0,75x):0,75

\(1\frac{1}{3}\):0,8=\(\frac{2}{3}\):(0,1x)

Answer 1

Tìm x trong các tỉ lệ thức sau :

\(\left(a\right)3,8\div\left(2x\right)=\frac{1}{4}\div2\frac{2}{3}\)

\(3,8\div\left(2x\right)=\frac{3}{32}\)

\(2x=3,8\div\frac{3}{32}\)

\(2x=40\frac{8}{15}\)

\(x=20\frac{4}{15}\)

\(\left(0,25x\right)\div3=\frac{5}{6}\div0,125\)

\(\left(0,25x\right)\div3=6\frac{2}{3}\)

\(\left(0,25x\right)=6\frac{2}{5}\times3\)

\(\left(0,25x\right)=20\)

\(x=80\)

\(0,01\div2,5=\left(0,75x\right)\div0,75\)

\(0,004=\left(0,75x\right)\div0,75\)

\(0,75x=0,75\times0,004\)

\(0,75x=0,003\)

\(x=0,004\)

\(1\frac{1}{3}\div0,8=\frac{2}{3}\div\left(0,1x\right)\)

\(1\frac{2}{3}=\frac{2}{3}\div\left(0,1x\right)\)

\(\left(0,1x\right)=\frac{2}{3}\div1\frac{2}{3}\)

\(\left(0,1x\right)=\frac{2}{5}\)

\(x=4\)

Dung ko z

Answer 2

bạn ghi ra đi mk giải cho (kb để mk ns cho dễ hiểu)