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能简算的用简便方法计算.(25-25÷2)×531516-(712+16)×12204÷19
问题详情
能简算的用简便方法计算.
参考答案
(1)(25-25÷2)×53
=(25-15)×53
=15×53
=13;
(2)1516-(712+16)×12
=1516-34×12
=1516-38
=916;
(3)204÷191+204×9
=204×91+204×9
=204×(91+9)
=204×100
=20400;
(4)12×3.2+5.6×0.5+1.2×50%
=0.5×3.2+5.6×0.5+1.2×0.5
=0.5×(3.2+5.6+1.2)
=0.5×10
=5;
(5)[53-(25+34)]÷314
=[53-2320]÷314
=3160÷314
=115;
(6)99×9798
=(98+1)×9798
=98×9798+1×9798
=97+9798
=979798.
考点:方法