Question

42×14/99+14×31/99+52×7/99简便计算？

Answer 1

42×14/99+14×31/99+52×7/99简便计算如下：
42×14/99+14×31/99+52×7/99 %提取公因数14/99，52×7=26×14
=(42+31+26)×14/99
=99×14/99 %约去相同的分子分母
=14

Answer 2

42×14/99+14×31/99+52×7/99
=84×7/99+62×7/99+52×7/99
=7/99×(84+62+52)
=7/99×198
=14

Answer 3

7/99*（42*2+2*31+52） 乘法分配律简便
=7/99*198
=7/1*2
=14

Answer 4

42×14/99+14×31/99+52×7/99
=42×14/99+31×14/99+26×2×7/99
=42×14/99+31×14/99+26×14/99
=（42+31+26）×14/99
=99×14/99
=14