7*2-7=7
4*3+7=19
2*8:4=4
15:3-5=0
18-3*2=12
5*6*4=120
20*4+6=86
28-7*2=2
40:4*7=70
1 задание
1 - 20x 5 - 3a 9 - 11c
2 - 13x 6 - 12a 10 - 13y
3 - 6к 7 - 12y 11 - 34x
4 - 8y 8 - 9y 12 - 100x
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*** 1) 65c + 139
2) 86x + 63y
3) 12x + 27 + 155 - 85x = 182 - 73x