8-0.72= 0.72×2.5×4= 7.2÷0.8= 0.64÷1.6=
8.7÷2.9×2.9= 4.2÷0.1= 7.2+6.5+2.8= 1.5×0.75+1.5×0.25=
分析:按照計(jì)算法則直接進(jìn)行計(jì)算,②⑤⑦⑧可以運(yùn)用定律進(jìn)行簡算.
解答:
解:8-0.72=7.28 0.72×2.5×4=7.2 7.2÷0.8=9 0.64÷1.6=0.4
8.7÷2.9×2.9=8.7 4.2÷0.1=42 7.2+6.5+2.8=16.5 1.5×0.75+1.5×0.25=1.5
點(diǎn)評(píng):此題考查學(xué)生的計(jì)算能力,計(jì)算時(shí)要細(xì)心,同時(shí)注意個(gè)別題使用運(yùn)算定律可以進(jìn)行簡算.
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