100-20%x=90, x-90%=1.2×3, 解方程

2025-04-13 04:25:05
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回答1:

100-20%x=90,
20%x=100-90
x=10*5
x=50
x-90%=1.2×3
x-0.9=3.6
x=3.6+0.9
x=4.5