题目内容
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)运用乘法分配律简算;(2)先算除法,再算加法;(4)(8)运用减法的性质简算;(5)先算除法,再算减法;(7)任何数与0相乘都得0;(9)先算除法,再算乘法;(10)先算乘法,再算减法;(11)运用乘法结合律简算;(12)从左往右依次计算.
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.
(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.
点评:此题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算律简便计算.
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