Расскройте скобки: а) 4y- (3y- (2y+1) б) a- (2x- (2a-x) в) 3m- (3m+(3m- (m+3) г) b- (2c- (3b+(4c-5b)

А) 4y- (3y- (2y+1)=4y- (3y-2y-1)=4y- (y-1)=4y-y+1=3y+1 б) a- (2x- (2a-x)=a- (2x-2a+x)=a- (3x-2a)=a-3x+2a=3a-3x=3 (a-x) в) 3m- (3m+(3m- (m+3)=3m- (3m+(3m-m-3)=3m- (3m+3m-m-3)=3m-3m-3m+m+3=3-2mг) b- (2c- (3b+(4c-5b)=b- (2c- (3b+4c-5b)=b- (2c-3b-4c+5b)=b-2c+3b+4c-5b=2c-b