a) -3xy<do potęgi 3>-(2xy<do potęgi 3> dla x=1, y=2 b)-(-48a<do potęgi 2> + 10a)-(-4a-a<do potęgi 2> ) dla a=-1/7 <jedna siódma>

ewelinkax33

-3xy-(2xy) = -5xy = -5 * 1 * 2 = -5 * 8 = 40 -(-48a + 10a)-(-4a-a ) = 48a - 10a + 4a + a = 49a - 6a = 49 * (-1/7) - 6 * (-1/7) = 49 * 1/49 - 6/7 = 49/49 - 6/7 = 49/49 - 42/49 = 7/49 = 1/7

wercia97

a) -3xy-(2xy= -3xy³-2xy³= -5xy³= -5*1*2³= -40 b) -(-48a + 10a)-(-4a-a )= -(-48a²+10a-(-4a-a²)= 48a²-10a+4a+a²= 49a²-6a= 49*(-1/7)²-6*(-1/7)= 49*1/49+6/7= 1+6/7= 1⁶/₇

marcinheh

-3xy-(2xy) = -5xy = -5 * 1 * 2 = -5 * 8 = 40 -(-48a + 10a)-(-4a-a ) = 48a - 10a + 4a + a = 49a - 6a = 49 * (-1/7) - 6 * (-1/7) = 49 * 1/49 - 6/7 = 49/49 - 6/7 = 49/49 - 42/49 = 7/49 = 1/7

a) -3xy-(2xy dla x=1, y=2 b)-(-48a + 10a)-(-4a-a ) dla a=-1/7