Question

Câu 8 
a,1000:(x x 25)=8                         b,(x:30)x8=8x1350

Answer 1

\(1000:\left(x\times25\right)=8\\ x\times25=1000:8\\ x\times25=25\\ x=25:25=1\)

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\(\left(x:30\right)\times8=8\times1350\\ \left(x:30\right)\times8=10800\\ x:30=10800:8\\ x:30=1350\\ x=1350\times30\\ x=40500\)

Answer 2

x x 25 = 1000 :8

x x 25 = 125

x = 125 : 25 

x = 6

 

(x:30)x8= 10800

x : 30 = 10800 : 8

x : 30 = 1350

x = 1350 x 30 

x = 40500

Answer 3

\(a,1000:\left(x\times25\right)=8\)

\(\Leftrightarrow x\times25=1000:8\)

\(\Leftrightarrow x\times25=125\)

\(\Leftrightarrow x=125:5\)

\(b,\left(x:30\right)\times8=8\times1350\)

\(\Leftrightarrow x:30=10800:8\)

\(\Leftrightarrow x:30=1350\)

\(\Leftrightarrow x=1350\times30\)

\(\Leftrightarrow x=40500\)

\(\Leftrightarrow x=25\)