题目内容

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.
(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.
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