Question

Answer 1

a: \(\Rightarrow y\times\left(12,5+87,5\right)=1000\\ \Rightarrow y\times100=1000\\ \Rightarrow y=10\)

b: \(\Rightarrow y\times\left(45,7+3,6\right)=49,3\\ \Rightarrow y\times49,3=49,3\\ \Rightarrow y=1\)

Answer 2

\(a,\\ y.\left(12,5+87,5\right)=1000\\ y.100=1000\\ y=\dfrac{1000}{100}=10\)

\(b,\\ y.\left(45,7+3,6\right)=49,3\\ y.49,3=49,3\\ y=1\)

Dấu . là x nhé!!

Answer 3

\(a,y\times12,5+y\times87,5=8\times125\\ \Rightarrow y\times\left(12,5+87,5\right)=1000\\ \Rightarrow y\times100=1000\\ \Rightarrow y=1000:100\\ \Rightarrow y=10\\ b,45,7\times y+y\times3,6=49,3\\ \Rightarrow y\times\left(45,7+3,6\right)=49,3\\ \Rightarrow y\times49,3=49,3\\ \Rightarrow y=49,3:49,3\\ \Rightarrow y=1\)

Answer 4

\(a\)) \(y=10\)

\(b\)) \(y=1\)