问题
解答题
脱式计算,能简算的要简算.
|
答案
(1)456-56×8+92
=456-448+92
=8+92
=100;
(2)60450÷(50×30%)
=60450÷15
=4030;
(3)44×(
-5 11
)1 4
=44×
-44×5 11 1 4
=20-11
=9;
(4)7×
+13÷4-19×0.251 4
=7×
+13×1 4
-19×0.251 4
=(7+13-19)×0.25
=1×0.25
=0.25;
(5)0.75+2.5-1.5+0.25
=0.75+0.25+(2.5-1.5)
=1+1
=2;
(6)23×9.8
=23×10-23×0.2
=230-4.6
=225.4.