来源:学生作业帮 编辑:神马作文网作业帮 分类:数学作业 时间:2024/11/10 15:34:42
13.6+13.6乘9怎样简算
还有3.7乘9.9
3.12乘8+0.312乘20
2.9乘0.45+0.29乘4.2+0.029乘13
简便方法计算
13.6+13.6×9
=13.6×(1+9)
=13.6×10
=136
3.12×8+0.312×20
=3.12×8+3.12×2
=3.12×(8+2)
=3.2×10
=31.2
2.9×0.45+0.29×4.2+0.029×13
=2.9×0.45+2.9×0.42+2.9×0.13
=2.9×(0.45+0.42+0.13)
=2.9×1
=2.9