问题
解答题
解方程. (1)X+
(2)5X-3×
(3)75%X-0.5X=76. |
答案
(1)x+
x=121,3 8
x=121,11 8
x×11 8
=121×8 11
,8 11
x=88;
(2)5x-3×
=5 21
,5 7
5x-
=5 7
,5 7
5x-
+5 7
=5 7
+5 7
,5 7
5x×
=1 5
×10 7
,1 5
x=
;2 7
(3)75%x-0.5x=76,
0.25x=76,
0.25x÷0.25=76÷0.25,
x=304.