Question

puteti s ama ajutati la 15 exerciti?
1)(3+y)²=... 2)(y+2x)²=.... 3)(5x+13)²=... 4)(y+z)²=.. 5)(7x+3y)=... 6)(2-y)²=...7)(3x+2)²=...8)(7-y)²= ...9)(√2+y)²= ...10)(z-3z)²=...

Answer 1

trebuie sa stii formulele :
(a+b)²=a²+2ab+b²
(a-b)²=a²-2ab+b²

1)(3+y)²=9+6y+y²
2)(y+2x)²=y²+4xy+4x²
3)(5x+13)²=25x²+130x+169
4)(y+z)²=y²+2yz+z²
5)(7x+3y)=49x²+42xy+9y²
6)(2-y)²=4-4y+y²
7)(3x+2)²=9x²+12x+4
8)(7-y)²= 49-14y+y²
9)(√2+y)²= 2+2√2+y²
10)(z-3z)²=z²-6z²+9z²=4z²