Срочьно!
Доведіть тотожність:

1) 4(2-3м)-(6-м)-2(3м+4)=-17м-6

2) а+б-10аб=2а(3-б)-3б(а-2)-5(аб+а+б)

3) 6(5а-3)+(10-20а)-(6а-4)=5а-(3а-(2а-4))

4) (3м-7)*0.6-0.8(4м-5)-(-1.7-1.4м)=1.5

5) 7а(3б+4с)-3а(б+1/3с)=9а(2б+3с)
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