计算下面各题,怎样简便就怎样算.①2400÷25÷4 ②19×96+96...
计算下面各题,怎样简便就怎样算.①2400÷25÷4②19×96+962÷74③400-(1300÷65+35)④45×99+45⑤23.4-8.54-1.46⑥808×...
计算下面各题,怎样简便就怎样算.①2400÷25÷4 ②19×96+962÷74 ③400-(1300÷65+35)④45×99+45 ⑤23.4-8.54-1.46 ⑥808×125
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①2400÷25÷4
=2400÷(25×4)
=2400÷100
=24;
②19×96+962÷74
=1824+13
=1837;
③400-(1300÷65+35)
=400-(20+35)
=400-55
=345;
④45×99+45
=45×(99+1)
=45×100
=4500;
⑤23.4-8.54-1.46
=23.4-(8.54+1.46)
=23.4-10
=13.4;
⑥808×125
=(101×8)×125
=101×(8×125)
=101×1000
=101000.
=2400÷(25×4)
=2400÷100
=24;
②19×96+962÷74
=1824+13
=1837;
③400-(1300÷65+35)
=400-(20+35)
=400-55
=345;
④45×99+45
=45×(99+1)
=45×100
=4500;
⑤23.4-8.54-1.46
=23.4-(8.54+1.46)
=23.4-10
=13.4;
⑥808×125
=(101×8)×125
=101×(8×125)
=101×1000
=101000.
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