小数的简便运算
加法交换律: 加法结合律:
乘法交换律: 乘法结合律:
乘法分配律: 连除的性质:
例题讲解:
加减法的简便运算
3.25+1.79-0.59+1.75 1.23+3.4-0.23+6.6 14-7.32-2.68 乘除法的简便运算
17.8÷(1.78×4) (45.9-32.7)÷8÷0.125 连减的性质:
23.4-0.8-13.4-7.2 3.2+0.36+4.8+1.64 12.7-(3.7+0.84) 36.54-1.76-4.54
2.64+8.67+7.36+11.33 9.43-(6.28-1.57) 1.25×2.5×32 3.65×10.1
5.6÷1.25÷0.8÷2.5÷0.4 4.36×12.5×8
7.2×0.2+2.4×1.4 8.9×1.01 7.74×(2.8-1.3)+1.5×2.26
3.9×2.7+3.9×7.3 18-1.8÷0.125÷0.8 12.7×9.9+1.27
0.25×16.2×4 (1.25-0.125)×8 3.6×102 320÷1.25÷8
3.72×3.5+6.28×3.5 1 4.8×7.8+78×0.52 0.8×100.1
课堂巩固
6.9+4.8+3.1 0.456+6.22+3.78 15.89+(6.75-5.89)
4.02+5.4+0.98 5.17-1.8-3.2 13.75-(3.75+6.48)
3.68+7.56-2.68 7.85+2.34-0.85+4.66 35.6-1.8-15.6-7.2
3.82+2.9+0.18+9.1 9.6+4.8-3.6 7.14-0.53-2.47
5.27+2.86-0.66+1.63 13.35-4.68+2.65 73.8-1.64-13.8-5.36
18.76×9.9+18.76 3.52÷2.5÷0.4 56.5×9.9+56.5
515.6×13.1-15.6-15.6×2.1 4.8×7.8+78×0.52 56.5×9.9+56.5
0.86×15.7-0.86×14.7 2.4×102 2.31×1.2×0.5
课后巩固
66.86-8.66-1.34 36.8-3.9-6.1 32+4.9-0.9
25.48-(9.4-0.52) 32+4.9-0.9 7.6×0.8+0.2×7.6 13.7×0.25-3.7÷4 101×0.87-0.91×87 3.9-4.1+6.1-5.9 15.02-6.8-1.02
146.5-(23+46.5) 15.89+(6.75-5.89)
0.85×199 0.25×8.5×4
2.22×9.9+6.66×6.7 2.3×16+2.3×23+2.3 ×16.1-15.1×10.7 3.65×4.7-36.5×0.37
10.7
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