问题
解答题
解方程. 6.8-0.8x=2 x:
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答案
(1)6.8-0.8x=2,
6.8-0.8x+0.8x=2+0.8x,
2+0.8x=6.8,
2+0.8x-2=6.8-2,
0.8x=4.8,
0.8x÷0.8=4.8÷0.8,
x=6;
(2)x:
=1 4
:2 5
,3 10
x=3 10
×1 4
,2 5
x=3 10
,1 10
x÷3 10
=3 10
÷1 10
,3 10
x=
×1 10
,10 3
x=
.1 3