问题 解答题
脱式计算,能简算的要简算.
456-56×8+9260450÷(50×30%)44×(
5
11
-
1
4
1
4
+13÷4-19×0.25
0.75+2.5-1.5+0.2523×9.8.
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×

5
11
-44×
1
4

=20-11

=9;

(4)7×

1
4
+13÷4-19×0.25

=7×

1
4
+13×
1
4
-19×0.25

=(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.

单项选择题
单项选择题