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2009-09-28T17:42:38+02:00
A.(2X-5)x2X-4(X²+1)=1
4X²-10²X-4X²-4=1/+4
-10X=5/÷(-10)
X=½
B.(X-4)x(x+1)+4(x+2)=x²-3
X²+X-4X-4+4X+8=X²-3
X²+X+4=X²-3/-X²
X+4=-3/-4
X=-7

C.(X-3)X(X+3)-(X-2)²=19
X²-9-(X²-4X+4)=19
X²-9-X²+4X-4=19
4X-13=19/+13
4X=32/÷4
X=8