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2x-y=12
x+2y=1
2x-y=12
x=1-2y
2(1-2y)-y=12
x=1-2y
2-4y-y=12
x=1-2y
-5y=12-2=10
x=1-2y
y=10/-5=-2
x=1-2y
y=-2
x=1-2(-2)
y=-2
x=1-4
y=-2
x=-3
1. nie wiem czy dobrze.
7%x=28
7/100*x=28
x=28*100/7
x=400
4.
a)2^4*4^3:2^8=16*64:256=1024:256=4
b)5^3*15^3*25*3* (1/125)^3=125*3375*15625*1/1953125=6591796875/1953125=3375
c)(2x-1)^2=4x^2-1
d) 2,(12)=2,12
reszty nie wiem :)