解方程80%x+25%x=42
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![解方程80%x+25%x=42](/uploads/image/z/303346-10-6.jpg?t=%E8%A7%A3%E6%96%B9%E7%A8%8B80%25x%2B25%25x%3D42)
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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
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