Question

zvolta aplicând formulele de calcul prescurtat
a)(x+2y)²
b)(y+x)²
c)(a+0,7)²
d)(3+y)²
e)(2,5-2y)²
f)(1,6+b)²
Va rog urgent!
Va multumesc!

Answer 1

a)(x+2y)²=x²+2x × 2y+2y²=x²+4xy+2y²
b)(x+y)²=x²+2xy+y²
c) (a+7/10)²=a²+2×a×7/10+(7/10)²=a²+7a/5+49/100
d) (3+y)²=3²+6y+y²=9+6y+y²
e)(25/10-2y)²=625/100-2×25/10×2y+2y²=625/100-50y+2y²
f)(16/10+b)²=256/100+2×16/10×b+b²=256/100+16/5b+b²