解方程:(1)40%x+25%x=130; (2)x-20%x=40; (3)40%x+30=80

2024-12-30 18:32:31
推荐回答(1个)
回答1:

供敞垛缎艹等讹劝番滑
(1)60%x+25=40
60%x+25-25=40-25
60%x÷60%=15÷60%
x=25;
(2)x-10%x=18
90%x=18
90%x÷90%=18÷90%
x=20;
(3)x+30%x=52
130%x=52
130%x÷130%=52÷130%
x=40;
(4)(1-25%)x=26
75%x=26
75%x÷75%=26÷75%
x=34
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