№1
1) 7+(-3b+2)=7-3b+2=7+2-3b=9-3b
2) 19-(6x+8)=19-6x-8=19-8-6x=11-6x
3) -(12c+5)+(7+12)=-12c-5+7+12=-12c+14=14-12c
№2
1) 7(а-4)+6(2-а)=7a-28+12-6a=7a-6a+12-28=a-16
2) 3(-2с+4)-(2-4с)=-6c+12-2+4c=12-2+4c-6c=10-2c
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Answers & Comments
№1
1) 7+(-3b+2)=7-3b+2=7+2-3b=9-3b
2) 19-(6x+8)=19-6x-8=19-8-6x=11-6x
3) -(12c+5)+(7+12)=-12c-5+7+12=-12c+14=14-12c
№2
1) 7(а-4)+6(2-а)=7a-28+12-6a=7a-6a+12-28=a-16
2) 3(-2с+4)-(2-4с)=-6c+12-2+4c=12-2+4c-6c=10-2c