1-13/14×7/9-2/9÷14/13(简便计算)
问题描述:
1-13/14×7/9-2/9÷14/13(简便计算)
答
其实就是分数的分子分母相互约分.
1-13/14×7/9-2/9÷14/13
=1-13/18-2/9x13/14(14和7约分)
=1-13/18-13/63(2和14约分)
=5/18-13/63
=(5x7-13x2)/(18x7)(通分)
=9/(18x7)=1/14
答
=1-13/14×7/9-2/9×13/14
=1-13/14×(7/9+2/9)
=1-13/14×1
=1-13/14
=1/14