遞等式計(jì)算(能簡(jiǎn)便的要簡(jiǎn)便計(jì)算)
9.6÷0.4×0.25
8.68-8.68÷0.56×0.5 29.7÷(5.85÷0.65)
1.25×3.2×0.8 14.5×102 4.7×4.7+4.7+4.7×4.3.
分析:9.6÷0.4×0.25,按運(yùn)算順序進(jìn)行計(jì)算;
8.68-8.68÷0.56×0.5,先利用除法的性質(zhì)把原式改為8.68-8.68×(0.5÷0.56),然后用乘法分配律的逆運(yùn)算簡(jiǎn)算;
29.7÷(5.85÷0.65),此題按運(yùn)算順序計(jì)算,先算括號(hào)內(nèi)的,再算括號(hào)外的;
1.25×3.2×0.8,用乘法交換律和乘法結(jié)合律簡(jiǎn)算;
14.5×102,把102看作(100+2),然后用乘法分配律簡(jiǎn)算;
4.7×4.7+4.7+4.7×4.3,把4.7看作4.7×1,用乘法分配律簡(jiǎn)算.
解答:解:9.6÷0.4×0.25,
=24×0.25,
=0.25×4×6,
=6;

8.68-8.68÷0.56×0.5,
=8.68-8.68×(0.5÷0.56),
=8.68×(1-0.5÷0.56),
=8.68×0.06÷0.56,
=8.68×
3
28

=0.93;

29.7÷(5.85÷0.65),
=29.7÷9,
=3.3;

1.25×3.2×0.8,
=(1.25×0.8)×3.2,
=1×3.2,
=3.2;

14.5×102,
=14.5×(100+2),
=14.5×100+14.5×2,
=1450+29,
=1479;

4.7×4.7+4.7+4.7×4.3,
=(4.7+1+4.3)×4.7,
=10×4.7,
=47.
點(diǎn)評(píng):此題考查學(xué)生小數(shù)四則混合運(yùn)算的順序,以及靈活運(yùn)用運(yùn)算定律簡(jiǎn)算的能力.
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