X+X*4/5=720 怎么解,最后是等于400.

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X+X*4/5=720怎么解,最后是等于400.X+X*4/5=720怎么解,最后是等于400.X+X*4/5=720怎么解,最后是等于400.x+X*4/5=720x+0.8x=7201.8x=72

X+X*4/5=720 怎么解,最后是等于400.
X+X*4/5=720 怎么解,最后是等于400.

X+X*4/5=720 怎么解,最后是等于400.
x+X*4/5=720
x+0.8x=720
1.8x=720
x=720÷1.8
x=400

X+X*4/5=720
两边同时乘以5
5x+4x=3600
9x=3600
两边同时除以9
x=400