Câu hỏi của phan thi van anh

Question

tìm x biết a) $\frac{13+x}{20}=\frac{3}{4}$b)$\frac{23-x}{25}=\frac{4}{5}$

Lil Meow Meow · Accepted Answer

a) $\frac{13+x}{20}=\frac{3}{4}$$\Rightarrow\frac{13+x}{20}=\frac{15}{20}$$\Rightarrow13+x=15$$\Rightarrow$        $x=15-13$$\Rightarrow$$x=2$b)$\frac{23-x}{25}=\frac{4}{5}$$\Rightarrow\frac{23-x}{25}=\frac{20}{25}$$\Rightarrow23-x=20$$\Rightarrow$        $x=23-20$ $\Rightarrow$        $x=3$Câu trả lời: a) $\frac{13+x}{20}=\frac{3}{4}$$\Rightarrow\frac{13+x}{20}=\frac{15}{20}$$\Rightarrow13+x=15$$\Rightarrow$        $x=15-13$$\Rightarrow$$x=2$b)$\frac{23-x}{25}=\frac{4}{5}$$\Rightarrow\frac{23-x}{25}=\frac{20}{25}$$\Rightarrow23-x=20$$\Rightarrow$        $x=23-20$ $\Rightarrow$        $x=3$

Nguyễn Thị Hạnh · Answer

a, 13+x/20= 3/4Suy ra: ( 13+x). 4= 20.3Suy ra: (13+x).4=60Suy ra: 13+x=60:4Suy ra: 13+x=15Suy ra: x=15-13Suy ra: x=2Vậy x=2Câu trả lời: a, 13+x/20= 3/4Suy ra: ( 13+x). 4= 20.3Suy ra: (13+x).4=60Suy ra: 13+x=60:4Suy ra: 13+x=15Suy ra: x=15-13Suy ra: x=2Vậy x=2

Gundam · Answer

a$\frac{13+x}{20}=\frac{3}{4}\Rightarrow\left(13+x\right)\times4=20\times3$$\left(13+x\right)\times4=60$$13+x=60:4=15$$x=15-13=2$Vậy x=2b,$\frac{23-x}{25}=\frac{4}{5}=\left(23-x\right)\times5=25\times4$$\left(23-x\right)\times5=100\Rightarrow23-x=100:5=20$$x=23-20=3$Vậy x = 3Câu trả lời: a$\frac{13+x}{20}=\frac{3}{4}\Rightarrow\left(13+x\right)\times4=20\times3$$\left(13+x\right)\times4=60$$13+x=60:4=15$$x=15-13=2$Vậy x=2b,$\frac{23-x}{25}=\frac{4}{5}=\left(23-x\right)\times5=25\times4$$\left(23-x\right)\times5=100\Rightarrow23-x=100:5=20$$x=23-20=3$Vậy x = 3

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