rozwiąż równania a) 6+3x=10-x b) x+5-3x=8-2x c) 2(x-1)-5(2x+4)=3(x+6)-x d) 2(x-4)+3=3(x+5)= f)x do kwadratu -36=0 g)x(x+5)(2x-4)= h)1,2x-5=0,8x+3
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a)
6+3x=10-x
3x+x=10-6
4x=4 /:4
x=1
b)
x+5-3x=8-2x
x-3x+2x=8-5
0=3
równanie sprzeczne
c)
2(x-1)-5(2x+4)=3(x+6)-x
2x-2-10x-20=3x+18-x
2x-10x-3x+x=18+2+20
-10x = 40 / : (-10)
x= -4
d)
2(x-4)+3=3(x+5)
2x-8+3=3x+15
2x-3x=15+8-3
-x= 20 / * (-1)
x= -20
f)
g)
x(x+5)(2x-4) = x(2x²-4x+10x-20) = x (2x²+6x-20) = 2x³ + 6x² -20x
h)
1,2x-5=0,8x+3
1,2x-0,8x = 3+5
0,4x =8 / * 2,5
x =20