解方程:x-65%x=70 120%x-x=0.8 49+40%x=89.
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(1)x-65%x=70,
35%x=70,
35%x÷35%=70÷35%,
x=200;
(2)120%x-x=0.8,
20%x=0.8,
20%x÷20%=0.8÷20%,
x=4;
(3)49+40%x=89,
49+40%x-49=89-49,
40%x=40,
40%x÷40%=40÷40%,
x=100.
======以下答案可供参考======
供参考答案1:
x-65%x=70 0.35x=70 x=200
120%x-x=0.8 0.2x=0.8 x=4
49+40%X=89 0.4x=40 x=100
供参考答案2:
0.35x=70
x=70/0.35
x=2000.2x=0.8
2x=8x=40.4x=89-49
x=40/0.4
x=100 x-65%x=70 0.35x=70 x=200
120%x-x=0.8 0.2x=0.8 x=4
49+40%X=89 0.4x=40 x=100