脱式计算,能简算的要简算.
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| (1)456-56×8+92 =456-448+92 =8+92 =100; (2)60450÷(50×30%) =60450÷15 =4030; (3)44×(
=44×
=20-11 =9; (4)7×
=7×
=(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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