问题
解答题
|
答案
(1)X-
=1 8
,5 8
X-
+1 8
=1 8
+5 8
,1 8
X=
;3 4
(2)210+X=640,
210+X-210=640-210,
X=430;
(3)0.7X=0.56,
0.7X÷0.7=0.56÷0.7,
X=0.8.
|
(1)X-
=1 8
,5 8
X-
+1 8
=1 8
+5 8
,1 8
X=
;3 4
(2)210+X=640,
210+X-210=640-210,
X=430;
(3)0.7X=0.56,
0.7X÷0.7=0.56÷0.7,
X=0.8.