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×(1+9)
=13.6×10
=136
=3.12×8+3.12×2
=3.12×(8+2)
=3.2×10
=31.2
=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
1年前