问题
解答题
脱式计算,能够简算的一定要简算.
|
答案
①
÷[(3 8
+1 5
)×1 4
],3 8
=
÷3 8
÷(3 8
+1 5
),1 4
=1÷
,9 20
=1×
,20 9
=2
;2 9
②4-
÷4-4 5
,4 5
=4-
×4 5
-1 4
,4 5
=4-(
+1 5
),4 5
=4-1,
=3;
③9
+9.8+9.25×1 4
,1 5
=9.25×(9.8+0.2),
=9.25×10,
=92.5;
④25×(4×11)×7,
=(25×4)×(11×7),
=100×77,
=7700;
⑤(
+1 12
)÷3 5
,1 60
=(
+1 12
)×60,3 5
=60×
+1 12
×60,3 5
=5+36,
=41;
⑥101×120-83-37,
=101×120-(83+37),
=120×(101-1),
=120×100,
=12000.