问题
解答题
求为知数x.
(1)16.5-x=10.5
(2)0.37÷x=0.74
(3)x+3×0.7=6.5.
答案
(1)16.5-x=10.5,
16.5-x+x=10.5+x,
10.5+x-10.5=16.5-10.5,
x=6;
(2)0.37÷x=0.74,
0.37÷x×x=0.74×x,
0.74×x÷0.74=0.37÷0.74,
x=0.5;
(3)x+3×0.7=6.5,
x+2.1=6.5,
x+2.1-2.1=6.5-2.1,
x=4.4.