(-2/3)×（-5/6）-(-3/4)÷（-4/9）+(-5/6+2/3)÷(-7/12)×7/2的运算过程.

(-2/3)×（-5/6）-(-3/4)÷（-4/9）+(-5/6+2/3)÷(-7/12)×7/2的运算过程.
(-2/3)×（-5/6）-(-3/4)÷（-4/9）+(-5/6+2/3)÷(-7/12)×7/2的运算过程.

(-2/3)×（-5/6）-(-3/4)÷（-4/9）+(-5/6+2/3)÷(-7/12)×7/2的运算过程.
(-2/3)×（-5/6）-(-3/4)÷（-4/9）+(-5/6+2/3)÷(-7/12)×7/2
=5/4-27/16+(-1/6)÷(-7/12)×7/2
=5/4-27/16+2/7×7/2
=5/4-27/16+1
=9/16
我是自己一步一步写出来的.
很用心的说.