问题
解答题
脱式计算,能简算的要简算
(
(
|
答案
(1)
×7 9
+11 5
×2 9
,11 5
=(
+7 9
)×2 9
,11 5
=1×
,11 5
=
;11 5
(2)(
+1 4
-5 6
)×24,2 3
=
×24+1 4
×24-5 6
×24,2 3
=6+20-16,
=26-16,
=10;
(3)(
+4 5
)÷1 4
+7 3
,7 10
=
÷21 20
+7 3
,7 10
=
+9 20
,7 10
=
.23 20