问题
解答题
脱式计算.(能简算的要简算) ①14×75-624÷39 ②
③
④
|
答案
①14×75-624÷39
=1050-16,
=1034;
②
÷9+5 7
×4 7 1 9
=
×5 7
+1 9
×4 7
,1 9
=(
+5 7
)×4 7
,1 9
=
×9 7
,1 9
=
;1 7
③
+(2 3
-5 6
)÷3 4 3 8
=
+2 3
×1 12
,8 3
=
+2 3
,2 9
=
;8 9
④
÷[7 11
-(1-2 5
)].7 10
=
÷[7 11
-2 5
],3 10
=
÷7 11
,1 10
=
.70 11