Объяснение:
1) 2a·a²·3b·(-5y)-7x²·(-4y)=-30a³by+28x²y
2) 20xy+5yx-17xy=8xy
3) 3t²-5t²-11t-3t²+5t+11=-5t²-6t+11
4) 2x²+7xy-5x²-11xy+3y²=-3x²+3y²-4xy
При p=-3; q=-7:
2pq-2p-p+2q=-3p+2pq+2q=-3p+2q(p+1)=-3·(-3)+2·(-7)(-3+1)=9-14·(-2)=9+28=37
Объяснение:
1) 2a·a²·3b·(-5y)-7x²·(-4y)=-30a³by+28x²y
2) 20xy+5yx-17xy=8xy
3) 3t²-5t²-11t-3t²+5t+11=-5t²-6t+11
4) 2x²+7xy-5x²-11xy+3y²=-3x²+3y²-4xy
При p=-3; q=-7:
2pq-2p-p+2q=-3p+2pq+2q=-3p+2q(p+1)=-3·(-3)+2·(-7)(-3+1)=9-14·(-2)=9+28=37