1) -2,4m*(-3n)= 2,4m*3n= 7,2mn
2) -8а-12b+5а+17b= -3a+5b
3) a-(a+5)+(-7+a)= a-a-5-7+a= -5-7+a
4) -5(y-4)+(y+5)= -5y+20+y+5= -4y+25
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Answers & Comments
1) -2,4m*(-3n)= 2,4m*3n= 7,2mn
2) -8а-12b+5а+17b= -3a+5b
3) a-(a+5)+(-7+a)= a-a-5-7+a= -5-7+a
4) -5(y-4)+(y+5)= -5y+20+y+5= -4y+25