Question

matematyka z plusem dla 2 klasy gimnazjum
zadanie 3/79

a) 3(a+b)+(a-2b)
f) 4x(x-y-z)-2x(4x-y+z)

g) -3x do kwadratu(x- 2/3y)+5x(x do kwadratu -7xy)

h) -2√2(a+√2b)-4(a√2-2b)

Answer 1

a) 3(a+b)+(a-2b)=3a+3b+a-2b=4a+b

f) 4x(x-y-z)-2x(4x-y+z)=4x^2-4xy-4xz-8x^2+2xy-2xz=-4x^2-2xy-6xz

g) -3x^2(x- 2/3y)+5x(x^2 -7xy)=-3x^3+2x^2y+5x^3-35x^2y=2x^3-33x^2y

h) -2√2(a+√2b)-4(a√2-2b)=-2a√2-4b-4a√2+8b=-6a√2+4b

Answer 2

3(a+b)+(a-2b)=3a+3b+a-2b=4a+b

4x(x-y-z)-2x(4x-y+z)=4x2-4xy-4xz-8x2+2xy-2xz=-4x2-2xy-6xz

-3x2(x- 2/3y)+5x(x2 -7xy)=-3x3+3x2*2/3y+5x3-35x2y=2x3+32x2*(-1,(3))

-2√2(a+√2b)-4(a√2-2b)=-2√2a-2√2*√2b-4a√2-8b=-6a√2-12b

 

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