Question

Matematyka wokół nas

Zad. 7 s. 152

a)*6a

c)

Zad. 3 s. 158

a) (2x-3)-(x+5)+(x+4)

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

c)

d) -5(2b+3z)+2(2b-4z)

Answer 1

zad 3

c) 4(2y-7yx^)-3(y^-3y)=8y-28yx^-3y^-9y^=8y-28yx^-12y^

d)-5(2b+3z)+2(2b-4z)=-10b-15z+4b-8z=-6b-23z

Answer 2

zad 3

a) (2x-3)-(x+5)+(x+4) = 2x-4

b) (3a-2)-(a+4)+(a-3) = 3a-9

c) 4(2y-7yx^{2})-3(y^{2}-3y)=8y-28yx^{2}-3y^{2}-9y^{2}=8y-28yx^{2}-12y^{2}

d) -5(2b+3z)+2(2b-4z) = -10b-15z+4b-8z = -6b-23z