Ответ:

Объяснение:

(5x+1)²-(5x-3)²=25x²+10x+1-25x²+30x-9=40x-8=40*0.7-8=20

(a-b)²+2(a-b)b+b²=a²-2ab+b²+2ab-2b²+b²=a²=0.09

17a²-34ax+17x²=17(a-x)²=17(3.7-2.7)²=17

25x²-30xy+9y²+9x²+30xy+25y²=25(x²+y²)+9(x²+y²)=34(x²+y²)=34*50.5=1717

(5x+1)²-(5x-3)²=25x²+10x+1-25x²+30x-9=40x-8=40*0.7-8=20

(a-b)²+2(a-b)b+b²=a²-2ab+b²+2ab-2b²+b²=a²=0.09

17a²-34ax+17x²=17(a-x)²=17(3.7-2.7)²=17

25x²-30xy+9y²+9x²+30xy+25y²=25(x²+y²)+9(x²+y²)=34(x²+y²)=34*50.5=1717