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4.[( - 6又7分1 ) - ( -2 )] - [(-8) + ( - 12又7分3)]
=[( - 6又7分1 ) +2 )] - [-8- 12又7分3]
=[- 4又7分1 ] - [-20又7分3]
= -4又7分1 + 20又7分3
= 16又7分2

5a. (-6)(-9)(+3)
=(-)(-)(6)(9)(3)
=162

5b.(+14)(-4)分之(+7)(+2)(-8)
=(+7)(+2)(-8)÷(+14)(-4)
=(-112)÷(-56)
=2

6a. (-56)÷(-4)×(+7)
=14x7
=98

6b. (-32)(+3)÷(-24)(-2)
=(-96)÷48
=(-2)

8a. (+11) - (-2 ) × [(+6)÷(-3)+(-2)]
=(+11) - (-2 ) × [(-2)+(-2)]
=(+11) - (-2 ) × (-4)
=11 - 8
=3

8b. [(-5)(-2)-(+3)(=4)]÷[(-6)=(-4)]×(+2) ??????????
i think you want to ask:
[(-5)(-2)-(+3)(+4)]÷[(-6)+(-4)]×(+2)
=[10 - 12]÷[-10]× 2
=(-2)÷[-10]× 2
= 1/5 x2
= 2/5

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