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1)67/6

2)63/20

3)29/6

4)119/15

Пошаговое объяснение:

1) 31/3 - (29/6-7/2)+5/3 = 36/3-(29/6-24/6) = 36/3-5/6=72/6-5/6=67/6

2) 47/5-(25/3-29/4+31/6)=47/5-(50/6-29/4+31/6)=47/5-(81/6-29/4)=

=47/5-(27/2-29/4)=47/5-(54/4-29/4)=47/5-25/4 = 188/20-125/20=63/20

3) (53/8-1/2)-(23/4-13/6)+(77/8-22/3)=49/8-43/12+55/24=147/24-86/24+55/24=116/24=29/6

(53/8-1/2)=53/8-4/8=49/8(23/4-13/6)=69/12-26/12=43/12(77/8-22/3)=231/24-176/24=55/24

4)(150/30-13/5-2/15+6)-(7-83/12+1/4)=124/15-1/3=124/15-5/15=119/15

(150/30-13/5-2/15+6)=5+6-39/15-2/15=11-41/15=165/15-41/15=124/15(7-83/12+1/4)=84/12-83/12+3/12=4/12=1/3