簡便計(jì)算(要寫出簡便過程).
125×56
69×98+69×2
3.63-1.25+17.37-8.75
73×101-73.
解:(1)125×56,
=(125×8)×7,
=1000×7,
=7000;
(2)69×98+69×2,
=69×(98+2),
=69×100,
=6900;
(3)3.63-1.25+17.37-8.75,
=(3.63+17.17)-(1.25+8.75),
=20.8-10,
=10.8;
(4)73×101-73,
=73×(101-1),
=73×100,
=7300.
分析:(1)125×56,轉(zhuǎn)化為125×8×7,運(yùn)用乘法結(jié)合律進(jìn)行簡算;
(2)69×98+69×2,運(yùn)用乘法分配律進(jìn)行簡算;
(3)3.63-1.25+17.37-8.75,運(yùn)用加法結(jié)合律和減法的運(yùn)算性質(zhì)進(jìn)行簡算;
(4)73×101-73,運(yùn)用乘法分配律進(jìn)行簡算.
點(diǎn)評:此題考查的目的是根據(jù)算式的特別,靈活運(yùn)用運(yùn)算定律和運(yùn)算性質(zhì)進(jìn)行簡便計(jì)算.