Question

（+30）+（-17.5）+（-20）+（17.5）= 49又1/7+(-77.21+(-22.79)= (-23)-(-27)-27=

(-7又2/3)+(+4又1/2)-1/2= (-6)*(-5/4)*(-4)= (-3/4)*(-1又1/3)-8÷4=
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Answer 1

（+30）+（-17.5）+（-20）+（17.5）
= [(+30)+(-20)]+[(-17.5)+(17.5)]
=(+10)+0
=10
49又1/7+(-77.21+(-22.79)
=49又1/7+[(-77.21+(-22.79)]
=49又1/7+(-100)
=(-50又6/7)
(-23)-(-27)-27
= (-23)+27-27
=(-23)
(-7又2/3)+(+4又1/2)-1/2
=(-7又2/3)+[(+4又1/2)-1/2]
=(-7又2/3)+4
=(-3又2/3)
(-6)*(-5/4)*(-4)
= (-6)*[(-5/4)*(-4)]
= (-6)*(-5)
=30
(-3/4)*(-1又1/3)-8÷4
=(-3/4)*(-4/3)-8÷4
=1-2
=(-1)