能簡(jiǎn)算的要用簡(jiǎn)便方法計(jì)算
24.1×1.5+7.59×15 (3.7+17×0.4)÷3.5 75.36÷12-4.32×0.5
8.8×0.125 7.6×5.3+3.7×7.6 6.6÷(0.68+0.42)
解:①24.1×1.5+7.59×15,
=2.41×15+7.59×15,
=(2.41+7.59)×15,
=10×15,
=150;
②(3.7+17×0.4)÷3.5,
=(3.7+6.8)÷3.5,
=10.5÷3.5,
=3;
③75.36÷12-4.32×0.5,
=6.28-2.16,
=4.12;
④8.8×0.125,
=(8+0.8)×0.125,
=8×0.125+0.8×0.125,
=1+0.1,
=1.1;
⑤7.6×5.3+3.7×7.6,
=(5.3+3.7)×7.6,
=9×7.6,
=68.4;
⑥6.6÷(0.68+0.42),
=6.6÷1.1,
=6.
分析:①、⑤運(yùn)用乘法分配律的逆運(yùn)算簡(jiǎn)算;
②、③、⑥按運(yùn)算順序進(jìn)行計(jì)算;
④把8.8拆成8+0.8,與0.125進(jìn)行簡(jiǎn)算.
點(diǎn)評(píng):此題考查學(xué)生的運(yùn)算順序,以及靈活運(yùn)用運(yùn)算定律進(jìn)行簡(jiǎn)算的能力.