六道简便计算答案如下：

667÷23x11

=29×23÷23x11

=（30-1）x11

=330-11

=319

77x25-37x25

=25x(77-37)

=25x40

=1000

1.25x7x3.2

=1.25x8x7x0.4

=10x2.8

=28

1.25×(32x4/9+5/9x32)

=1.25x32x(4/9+5/9)

=1.25x8x4

=10x4

=40

(5/6+2/3)×0.9÷1/2

=(5/6+4/6)x9/10x2

=10/6x9/10x2

=3

7/12x1/7÷7/12x1/7

=1/12÷7/12x1/7

1/7x1/7

=1/49。