Question

[Nguyễn Bảo Ngân]

tìm y biết :

a) y x 27 + y x 30 + y x 43 = 210500

b) 15 x y + 85 x y = 300

Answer 1

[Phước Lộc]

a) \(y\times27+y\times30+y\times43=210500\)

\(y\times\left(27+30+43\right)=210500\)

\(y\times100=210500\)

\(y=210500\div100\)

\(y=2105\)

b) \(15\times y+85\times y=300\)

\(y\times\left(15+85\right)=300\)

\(y\times100=300\)

\(y=300\div100\)

\(y=3\)

Answer 2

[KWS]

\(a,y\times27+y\times30+y\times43=210500\)

\(\Rightarrow y\times\left(27+30+43\right)=210500\)

\(\Rightarrow y\times100=210500\)

\(\Rightarrow y=210500:100=2105\)

\(b,15\times y+85\times y=300\)

\(\Rightarrow y\times\left(15+85\right)=300\)

\(\Rightarrow y\times100=300\)

\(\Rightarrow y=300:100=3\)