看誰(shuí)算得對(duì)?
25×125×8×4
329×101
6×72+28×6
640÷[(96-80)×4].
解:(1)25×125×8×4,
=(25×4)×(125×8),
=100×1000,
=100000;
(2)329×101,
=329×100+329,
=32900+329,
=33229;
(3)6×72+28×6,
=6×(72+28),
=6×100,
=600;
(4)640÷[(96-80)×4],
=640÷[16×4],
=640÷64,
=10.
分析:(1)25×125×8×4,運(yùn)用乘法交換律和結(jié)合律進(jìn)行簡(jiǎn)算;
(2)329×101,運(yùn)用乘法分配律進(jìn)行簡(jiǎn)算;
(3)6×72+28×6,運(yùn)用乘法分配律進(jìn)行簡(jiǎn)算;
(4)640÷[(96-80)×4],根據(jù)整數(shù)四則混合運(yùn)算的運(yùn)算順序,按照四則運(yùn)算的計(jì)算法則進(jìn)行簡(jiǎn)算.
點(diǎn)評(píng):此題主要考查整數(shù)四則混合運(yùn)算,要求學(xué)生牢固掌握運(yùn)算順序和計(jì)算法則,并且能夠靈活選擇簡(jiǎn)便方法進(jìn)行計(jì)算.