計(jì)算下面各題,能簡(jiǎn)算的要簡(jiǎn)算.
①4.28-1.39-2.61 ②7.2×0.3+0.3×0.8 ③0.4×3.14×2.5 ④9.4×[3.6÷(5.4÷0.9)]
⑤840÷(0.23+0.37)÷7 ⑥23.7╳1.25╳8 ⑦12.5×102 ⑧9.1+0.9╳(22-18.7)
分析:依據(jù)小數(shù)四則混合運(yùn)算的運(yùn)算順序進(jìn)行計(jì)算即可.
解答:解:(1)4.28-1.39-2.61,
=4.28-(1.39+2.61),
=4.28-4,
=0.28;

(2)7.2×0.3+0.3×0.8,
=(7.2+0.8)×0.3,
=8×0.3,
=2.4;

(3)0.4×3.14×2.5,
=0.4×2.5×3.14,
=1×3.14,
=3.14;

(4)9.4×[3.6÷(5.4÷0.9)]
=9.4×[3.6÷6],
=9.4×0.6,
=5.64;

(5)840÷(0.23+0.37)÷7,
=840÷0.6÷7,
=1400÷7,
=200;

(6)23.7╳1.25╳8,
=23.7×(1.25×8),
=23.7×10,
=237;

(7)12.5×102,
=12.5×(100+2),
=12.5×100+12.5×2,
=1250+25,
=1275;

(8)9.1+0.9╳(22-18.7),
=9.1+0.9×3.3,
=9.1+2.97,
=12.07.
點(diǎn)評(píng):此題主要考查小數(shù)四則混合運(yùn)算的方法,要注意:能簡(jiǎn)便的要簡(jiǎn)便計(jì)算.
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