问题
解答题
解方程.
x+10.5=79.7
5x=0.25
7÷x=0.5
x÷1.1=3.
答案
(1)x+10.5=79.7,
x+10.5-10.5=79.7-10.5,
x=69.2;
(2)5x=0.25,
5x÷5=0.25÷5,
x=0.05;
(3)7÷x=0.5,
7÷x×x=0.5×x,
0.5x=7,
0.5x÷0.5=7÷0.5,
x=14;
(4)x÷1.1=3,
x÷1.1×1.1=3×1.1,
x=3.3.