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=4280%x+25%x=421.05x=42x=42÷1.05=4080%x+25%x=42105%x=42x=4
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