题目内容
脱式计算,能简算的要简算.
| 456-56×8+92 | 60450÷(50×30%) | 44×(
| ||||
7×
| 0.75+2.5-1.5+0.25 | 23×9.8. |
(1)456-56×8+92
=456-448+92
=8+92
=100;
(2)60450÷(50×30%)
=60450÷15
=4030;
(3)44×(
-
)
=44×
-44×
=20-11
=9;
(4)7×
+13÷4-19×0.25
=7×
+13×
-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.
=456-448+92
=8+92
=100;
(2)60450÷(50×30%)
=60450÷15
=4030;
(3)44×(
| 5 |
| 11 |
| 1 |
| 4 |
=44×
| 5 |
| 11 |
| 1 |
| 4 |
=20-11
=9;
(4)7×
| 1 |
| 4 |
=7×
| 1 |
| 4 |
| 1 |
| 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.
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