问题
解答题
解方程. (1)
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答案
(1)
-x=5 6
,1 2
-x+x=5 6
+x,1 2
+x=1 2
,5 6
+x-1 2
=1 2
-5 6
,1 2
x=
;1 3
(2)x+0.75-
=0.15,3 5
x+0.75-
+3 5
=0.15+3 5
,3 5
x+0.75=0.75,
x+0.75-0.75=0.75-0.75,
x=0;
(3)2x+
=4.625,5 8
2x+
-5 8
=4.625-5 8
,5 8
2x=4,
2x÷2=4÷2,
x=2.