问题
解答题
解方程:
60%x+90=102
x-20%=5.2
50%x+3x=28
9.1-14%x=0.7.
答案
60%x+90=102,
0.6x+90=102,
0.6x=102-90,
0.6x=12,
x=12÷0.6,
x=20;
x-20%=5.2,
x-0.2=5.2,
x=5.2+0.2,
x=5.4;
50%x+3x=28,
0.5x+3x=28,
3.5x=28,
x=28÷3.5,
x=8;
9.1-14%x=0.7,
9.1-0.14x=0.7,
0.14x=9.1-0.7,
0.14x=8.4,
x=8.4÷0.14,
x=60.