Question

[Trần Quỳnh Anh]

341*67+341*16+659*83                                                               30 phần trăm * x + x = 52                                       75 phần trăm *  x + \(\frac{3}{4}\)* x + x = 30

Answer 1

[Lê Minh Anh]

a)\(341\times67+341\times16+659\times83=\left[341\times\left(67+16\right)\right]+659\times83\)

\(=341\times83+659\times83=83\times\left(341+659\right)=83\times1000=83000\)

b)\(30\%\times x+x=52\Rightarrow\frac{3}{10}\times x+x=52\Rightarrow x\times\left(\frac{3}{10}+1\right)=52\)

\(\Rightarrow x\times1,3=52\Rightarrow x=52:1,3\Rightarrow x=40\)

c)\(75\%\times x+\frac{3}{4}\times x+x=30\Rightarrow\frac{3}{4}\times x+\frac{3}{4}\times x+x=30\Rightarrow x\times\left(\frac{3}{4}+\frac{3}{4}+1\right)=30\)

\(\Rightarrow x\times\frac{5}{2}=30\Rightarrow x=30:\frac{5}{2}\Rightarrow x=12\)

Answer 2

[Trần Quỳnh Anh]

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