Question

能简便计算要简便计算

1.1/4*1/4+3/4*1/4
2.7/13+1/2+39
3.3/10*（5/7-10/21）
4.23/5*9/10+27/5÷10/9
5.（1/7-1/9）*63-2/3

Answer 1

1、1/4*1/4+3/4*1/4
=（1/4+3/4)*1/4
=1*1/4
=1/4
2、7/13+1/2+39
=14/26+13/26+39
=27/26+39
=1又26分之1+39
=40又26分之1
3、3/10*（5/7-10/21）
=3/10*5/7-3/10*10/21
=3/14-1/7
=1/14
4、23/5*9/10+27/5÷10/9
=23/5*9/10+27/5*9/10
=（23/5+27/5）*9/10
=10*9/10
=9
5、（1/7-1/9）*63-2/3
=1/7*63-1/9*63-2/3
=9-7-2/3
=2-2/3
=1又1/3

Answer 2

1.1/4(1/4+3/4)=1/4*1=1/4
2.14/26+13/26+26*39/26=(14+13+26*39)/26=1041/26
3.3/10*(15/21-10/21)=3/10*5/21=1/14
4.23/5*9/10+27/5*9/10=9/10*(23/5+27/5)=9/10*10=9
5.9-7-2/3=2-2/3=6/3-2/3=4/3