Question

(-2/3)×（-5/6）-(-3/4)÷（-4/9）+(-5/6+2/3)÷(-7/12)×7/2的准确运算过程

请大家帮我一下！！！！！

Answer 1

先乘除，后加减啊。有括号先算括号里的

Answer 2

解:
(-2/3)×（-5/6）-(-3/4)÷（-4/9）+(-5/6+2/3)÷(-7/12)×7/2=
(-2/3)×（-5/6）-(-3/4)×（-9/4）+(-5/6+4/6)×(-12/7)×7/2=
(5/9)-(27/16)+(-1/6)×(-6)=
(80/144)-(243/144)+1=
(-163/144)+(144/144)= - 19/144

Answer 3

(-2/3)×（-5/6）-(-3/4)÷（-4/9）+(-5/6+2/3)÷(-7/12)×7/2
=2/3×5/6-3/4÷4/9-(5/6+2/3)÷7/12×7/2
=5/9-27/16-3/2×12/7×7/2
=-163/144-9
=-1459/144

应该是这样

Answer 4

(-2/3)×（-5/6）-(-3/4)÷（-4/9）+(-5/6+2/3)÷(-7/12)×7/2
=5/9-27/16+（-1/6）*（-12/7）*7/2
=5/9-27/16+1/3
=8/9-27/16
=128/144-243/144
=-115/144