问题
解答题
解方程.
(1)7x÷3=8.19
(2)4x-0.5x=0.7
(3)3.5×6-3x=11.4.
答案
(1)7x÷3=8.19,
x=8.19,7 3
x×7 3
=8.19×3 7
,3 7
x=3.51;
(2)4x-0.5x=0.7,
3.5x=0.7,
3.5x÷3.5=0.7÷3.5,
x=0.2;
(3)3.5×6-3x=11.4,
21-3x+3x=11.4+3x,
11.4+3x=21,
11.4+3x-11.4=21-11.4,
3x÷3=9.6÷3,
x=3.2.