问题
解答题
解方程: (1)8.7X-1.8X=20.7 (2)X÷1.2=6.5 (3)X-
|
答案
(1)8.7X-1.8X=20.7,
6.9X÷6.9=20.7÷6.9,
X=3;
(2)X÷1.2=6.5,
X÷1.2×1.2=6.5×1.2,
X=7.8;
(3)X-
=5 8
,1 2
X-
+5 8
=5 8
+1 2
,5 8
X=1
.1 8
解方程: (1)8.7X-1.8X=20.7 (2)X÷1.2=6.5 (3)X-
|
(1)8.7X-1.8X=20.7,
6.9X÷6.9=20.7÷6.9,
X=3;
(2)X÷1.2=6.5,
X÷1.2×1.2=6.5×1.2,
X=7.8;
(3)X-
=5 8
,1 2
X-
+5 8
=5 8
+1 2
,5 8
X=1
.1 8