题目内容
解方程.
| x-40%x=120 | 15x-30=150 | 70%x-10%x=15 | 35%x+x=27. |
(1)x-40%x=120,
60%x=120,
60%x÷60%=120÷60%,
x=200;
(2)15x-30=150,
15x-30+30=150+30,
15x=180,
15x÷15=180÷15,
x=12;
(3)70%x-10%x=15,
60%x=15,
60%x÷60%=15÷60%,
x=25;
(4)35%x+x=27,
135%x=27,
135%x÷135%=27÷135%,
x=20.
60%x=120,
60%x÷60%=120÷60%,
x=200;
(2)15x-30=150,
15x-30+30=150+30,
15x=180,
15x÷15=180÷15,
x=12;
(3)70%x-10%x=15,
60%x=15,
60%x÷60%=15÷60%,
x=25;
(4)35%x+x=27,
135%x=27,
135%x÷135%=27÷135%,
x=20.
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