解方程.
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(1)40%x+20=50,
40%x+20-20=50-20,
40%x=30,
40%x÷40%=30÷40%,
x=75;
(2)x-80%x=40,
20%x=40,
20%x÷20%=40÷20%,
x=200;
(3)65%X-35%X=210,
30%x=210,
30%x÷30%=210÷30%,
x=700.
解方程.
|
(1)40%x+20=50,
40%x+20-20=50-20,
40%x=30,
40%x÷40%=30÷40%,
x=75;
(2)x-80%x=40,
20%x=40,
20%x÷20%=40÷20%,
x=200;
(3)65%X-35%X=210,
30%x=210,
30%x÷30%=210÷30%,
x=700.