问题
解答题
简便计算. (1)
(2)48×(
(3)
|
答案
(1)
×7 41
+1 31
÷31,34 41
=
×7 41
+1 31
×34 41
,1 31
=(
+7 41
)×34 41
,1 31
=1×
,1 31
=
;1 31
(2)48×(
+1 8
-1 6
),1 12
=48×
+48×1 8
-48×1 6
,1 12
=6+8-4,
=10;
(3)
×37%+1 5
×37%,4 5
=
×0.37+1 5
×0.37,4 5
=(
+1 5
)×0.37,4 5
=1×0.37,
=0.37.