0.79+0.79×99= 1÷5+1÷5= 0.89×101-0.89= 2-0.64-0.36=
1.1-2.7÷27= 12.4×11-12.4= 1.25×3.3×0= 20-3.7-7.3=
5×0.75÷1.5×0.75= 1-0.1×0.1= 6×0.125×8= 1×0.4÷1×0.4=
分析:(1)(3)(6)運用乘法分配律簡算;(2)先算除法,再算加法;(4)(8)運用減法的性質(zhì)簡算;(5)先算除法,再算減法;(7)任何數(shù)與0相乘都得0;(9)先算除法,再算乘法;(10)先算乘法,再算減法;(11)運用乘法結(jié)合律簡算;(12)從左往右依次計算.
解答:解:
(1)0.79+0.79×99=79;       (2)1÷5+1÷5=0.4;     (3)0.89×101-0.89=89; (4)2-0.64-0.36=1;

(5)1.1-2.7÷27=1;           (6)12.4×11-12.4=124; (7)1.25×3.3×0=0;    (8)20-3.7-7.3=9;

(9)5×0.75÷1.5×0.75=1.875;(10)1-0.1×0.1=0.99; (11)6×0.125×8=6;(12)1×0.4÷1×0.4=0.16.
點評:此題考查了四則混合運算,注意運算順序和運算法則,靈活運用所學(xué)的運算律簡便計算.
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