Question

3.3 Pomnóż:

a) (1/2x - 1/3y) (2/3x+ 3/4y)

b) (x - 1/2y) (1/2x + y)

c) (2/3a - 3/4b) (1/3a - 4/5b)

d) (4/5x - 2/7y) (5/6x + 7/8y)

e) (1/2x + 1/4) (x² + 6x + 8)

f) (3x - 1/2) (2x - 1/3)

g) (0,8a - 0,3b) (0,2a + 0,7b)

h) (1,4x + 0,5y) (1,2x - 0,6y)

i) (1,25x - 2) (0,8x + 1)

Answer 1

a)  2/6x²+3/8xy-2/9xy-3/12y²=1/3x²+27/72xy-16/72xy-3/12y²=1/3x²+11/72xy-3/12y²
b) 1/2x²+xy-1/4xy-1/2y²=1/2x²+3/4xy-1/2y²
c)2/9a²-8/15ab-3/12ab+12/20b²=2/9a²-8/15ab-1/4ab+3/5b²=2/9a²-32/60ab-15/60ab+3/5b²=
   =2/9a²-47/60ab+3/5b²
d)20/30x²+28/40xy-10/42xy-14/56y²=2/3x²+7/10xy-5/22xy-1/4y²=2/3x²+77/110xy-25/110xy-1/4y²=
   =2/3x²+52/110xy-1/4y²=2/2x²+26/55xy-1/4y²
e)1/2x³+3x²+4x+1/4x²+3/2x+2=1/2x³+13/4x²+11/2x+2
f) 6x²-x-x+1/6=6x²-2x+1/6
g) 0,16a²+0,56ab-0,06ab-0,21b²=0,16a²+0,5ab-0,21b²
h) 1,68x²-0,84xy+0,6xy-0,3y²=1,68x²-0,24xy-0,3y²
i) x²+1,25x-1,6x-2=x²-0,35x-2 

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