21⼀3×5⼀42×5⼀3×1⼀2+4⼀3怎么用简便运算

2024-12-18 22:09:25
推荐回答(4个)
回答1:

21/3×5/42×5/3×1/2+4/3怎么用简便运算:
简算过程如下:
21/3×5/42×5/3×1/2+4/3
=7×5/42×5/3×1/2+4/3
=5/6×5/3×1/2+4/3
=25/18×1/2+4/3
=25/36+48/36
=73/36=2又1/36
其实就是先算出21/3=21÷3=7,再用7和5/42约分。剩下的口算就可以了

回答2:

简算过程如下: 21/3×5/42×5/3×1/2+4/3 =7×5/42×5/3×1/2+4/3 =5/6×5/3×1/2+4/3 =25/18×1/2+4/3 =25/36+48/36 =73/36=2又1/36 其实就是先算出21/3=21÷3=7,再用7和5/42约分。剩下的口算就可以了

回答3:

简算过程如下:
21/3×5/42×5/3×1/2+4/3
=7×5/42×5/3×1/2+4/3
=5/6×5/3×1/2+4/3
=25/18×1/2+4/3
=25/36+48/36
=73/36=2又1/36
其实就是先算出21/3=21÷3=7,再用7和5/42约分。剩下的口算就行了(都是乘法口诀能解决的)

回答4:

简算过程如下:
21/3×5/42×5/3×1/2+4/3
=7×5/42×5/3×1/2+4/3
=5/6×5/3×1/2+4/3
=25/18×1/2+4/3
=25/36+48/36
=73/36=2又1/36
其实就是先算出21/3=21÷3=7,再用7和5/42约分。剩下的口算就可以了