问题
解答题
解方程.
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答案
(1)6x+3.6=12,
6x+3.6-3.6=12-3.6,
6x=8.4,
6x÷6=8.4÷6,
x=1.4;
(2)8x+25=57,
8x+25-25=57-25,
8x=32,
8x÷8=32÷8,
x=4;
(3)0.8+3.6x=1.52,
0.8-0.8+3.6x=1.52-0.8,
3.6x=0.72,
3.6x÷3.6=0.72÷3.6,
x=0.2;
(4)
x=18,3 4
x÷3 4
=18÷3 4
,3 4
x=18×
,4 3
x=24;
(5)
x=3 5
,6 7
x÷3 5
=3 5
÷6 7
,3 5
x=
×6 7
,5 3
x=
;10 7
(6)
x÷14=7 4
,1 2
x÷14×14=7 4
×14,1 2
x=7,7 4
x÷7 4
=7÷7 4
,7 4
x=7×
,4 7
x=4.