解方程80%x+25%x=42

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解方程80%x+25%x=42

解方程80%x+25%x=42
解方程80%x+25%x=42

解方程80%x+25%x=42
80%x+25%x=42
1.05x=42
x=42÷1.05
=40

80%x+25%x=42
105%x=42
x=42÷1.05
x=40

80%x+25%x=42
105%X=42,
X=40

80%x+25%x=42
0.8x+0.25x=42
1.05x=42
x=42/1.05
x=40

化成小数算就出来了。

105%x=42
x=400