问题
解答题
解方程. (1)
(2)x-
(3)75%(x+1.2)=7.2 (4)
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答案
(1)
x-0.6=9.63 4
x-0.6+0.6=9.6+0.63 4
x=10.23 4
x÷3 4
=10.2÷3 4 3 4
x=13.6;
(2)x-
x=2403 8
(1-
)x=2403 8
x=2405 8
x÷5 8
=240÷5 8 5 8
x=384;
(3)75%(x+1.2)=7.2
75%(x+1.2)÷75%=7.2÷75%
x+1.2-1.2=9.6-1.2
x=8.4;
(4)
:x=1.2:62 3
1.2x=
×62 3
1.2x÷1.2=
×6÷1.22 3
x=3
.1 3