题目内容
计算下面各题,怎样简便就怎样算. ①468×5+232×5 |
②900÷25÷4 |
③15.6-4.47-5.53+6.4 | ④23.76-(5.76-4.23) |
⑤19×96+962÷74 | ⑥400-(1300÷65+35) |
⑦6.75+0.5-4.86 | ⑧88×125. |
分析:①可根据乘法分配律计算;
②可根据一个数除以两个数,等于除以这两个数的积的除法性质计算;
③可根据加法交换律及一个数减两个数,等于减去这两个数的和的减法性质计算;
④可根据一个数减两个数的差,等于减去两个数中的被减数,加上减数的减法性质计算;
⑤⑥⑦根据四则混合运算的运算顺序计算即可;
⑧可将88拆分为11×8后根据乘法结合律计算.
②可根据一个数除以两个数,等于除以这两个数的积的除法性质计算;
③可根据加法交换律及一个数减两个数,等于减去这两个数的和的减法性质计算;
④可根据一个数减两个数的差,等于减去两个数中的被减数,加上减数的减法性质计算;
⑤⑥⑦根据四则混合运算的运算顺序计算即可;
⑧可将88拆分为11×8后根据乘法结合律计算.
解答:解:①468×5+232×5
=(468+232)×5,
=700×5,
=3500;
②900÷25÷4
=900÷(25×4),
=900÷100,
=9;
③15.6-4.47-5.53+6.4
=15.6+6.4-(4.47+5.53),
=22-10,
=12;
④23.76-(5.76-4.23)
=23.76-5.76+4.23,
=18+4.23,
=22.23;
⑤19×96+962÷74
=1824+13,
=1837;
⑥400-(1300÷65+35)
=400-(20+35),
=400-55,
=345;
⑦6.75+0.5-4.86
=7.25-4.86,
=2.39;
⑧88×125
=11×(8×125),
=11×1000,
=11000.
=(468+232)×5,
=700×5,
=3500;
②900÷25÷4
=900÷(25×4),
=900÷100,
=9;
③15.6-4.47-5.53+6.4
=15.6+6.4-(4.47+5.53),
=22-10,
=12;
④23.76-(5.76-4.23)
=23.76-5.76+4.23,
=18+4.23,
=22.23;
⑤19×96+962÷74
=1824+13,
=1837;
⑥400-(1300÷65+35)
=400-(20+35),
=400-55,
=345;
⑦6.75+0.5-4.86
=7.25-4.86,
=2.39;
⑧88×125
=11×(8×125),
=11×1000,
=11000.
点评:完成本题要注意分析式中数据的特点,能简便计算的要简便计算.
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