8.4×0.82÷4.2 0.8÷0.32×0.4 0.8×9.6×2.5÷2.4 13.2÷8.8×0.8 (8.91-6.82)+(1.09+3.18)1.25×4.2÷(0.6÷8) 6×994+36 96+188×8 180+98×10 888+999 (16.8+1.4)÷0.7

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/08 09:56:08

8.4×0.82÷4.2 0.8÷0.32×0.4 0.8×9.6×2.5÷2.4 13.2÷8.8×0.8 (8.91-6.82)+(1.09+3.18)1.25×4.2÷(0.6÷8) 6×994+36 96+188×8 180+98×10 888+999 (16.8+1.4)÷0.7
8.4×0.82÷4.2 0.8÷0.32×0.4 0.8×9.6×2.5÷2.4 13.2÷8.8×0.8 (8.91-6.82)+(1.09+3.18)
1.25×4.2÷(0.6÷8) 6×994+36 96+188×8 180+98×10 888+999 (16.8+1.4)÷0.7

8.4×0.82÷4.2 0.8÷0.32×0.4 0.8×9.6×2.5÷2.4 13.2÷8.8×0.8 (8.91-6.82)+(1.09+3.18)1.25×4.2÷(0.6÷8) 6×994+36 96+188×8 180+98×10 888+999 (16.8+1.4)÷0.7
8.4×0.82÷4.2 =(8.4÷4.2)×0.82=1.64;
0.8÷0.32×0.4化成分数做;
0.8×9.6×2.5÷2.4也是用约分比较好;9.6÷2.4=4,再×2.5×0.8=8;
96+188×8=12×8+188×8=8×(12+188)=200×8=1600;
13.2÷8.8×0.8这道题用约分的方式更好;
(8.91-6.82)+(1.09+3.18)=8.91+1.09-(6.82-3.81)=10-3.01=6.99;
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用分数式做就很简单了