провести подрбные слагаемые (33-34):
1) 4а+2b+a-b
2) x-2y-3x+5y
3) 0,1c-0,3+d-c-2,1d
4) 8,7-2m+n- 1/3m + 2/3 n
1) 4а+2b+a-b
2) x-2y-3x+5y
3) 0,1c-0,3+d-c-2,1d
4) 8,7-2m+n- 1/3m + 2/3 n
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