问题
解答题
计算下面各题,能算简算的要简算.
|
答案
(1)(
+80)×125,2 5
=
×125+80×125,2 5
=50+10000,
=10050;
(2)
÷7 8
+15 13
×1 8
,13 15
=
×7 8
+13 15
×1 8
,13 15
=(
+7 8
)×1 8
,13 15
=1×
,13 15
=
;13 15
(3)
×(3 8
-2 3
)×1 5
,3 14
=
×3 8
×7 15
,3 14
=
×(3 8
×7 15
),3 14
=
×3 8
,1 10
=
.3 80