2.8×9.05+9.8×1.05
6.7×5.3-4.7+5.3
5.68-4.45+5.32-2.55
57.7÷0.1-477÷(13.26-11.76)
3.24×2.6-3.24+3.24×8.4
[0.15+(4.74-1.8)÷0.4]÷0.1.
分析:(1)先同時(shí)運(yùn)算乘法,再算加法;
(2)先算乘法,再算減法最后算加法;
(3)運(yùn)用加法結(jié)合律以及減法的性質(zhì)簡算;
(4)先算小括號(hào)里面的減法,再同時(shí)運(yùn)算除法,最后算括號(hào)外的減法;
(5)運(yùn)用乘法分配律簡算;
(6)先算小括號(hào)里面的減法,再算小括號(hào)里面的除法,然后算中括號(hào)里面的加法,最后算括號(hào)外的除法.
解答:解:(1)2.8×9.05+9.8×1.05,
=25.34+10.29,
=35.63;

(2)6.7×5.3-4.7+5.3,
=35.51-4.7+5.3,
=30.81+5.3,
=36.11;

(3)5.68-4.45+5.32-2.55,
=(5.68+5.32)-(4.45+2.55),
=11-7,
=4;

(4)57.7÷0.1-477÷(13.26-11.76),
=57.7÷0.1-477÷1.5,
=577-318,
=259;

(5)3.24×2.6-3.24+3.24×8.4,
=3.24×(2.6-1+8.4),
=3.24×10,
=32.4;

(6)[0.15+(4.74-1.8)÷0.4]÷0.1,
=[0.15+2.94÷0.4]÷0.1,
=[0.15+7.35]÷0.1,
=7.5÷0.1,
=75.
點(diǎn)評(píng):本題考查了四則混合運(yùn)算,注意運(yùn)算順序和運(yùn)算法則,靈活運(yùn)用所學(xué)的運(yùn)算定律進(jìn)行簡便計(jì)算.
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