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x 2x 5 4x 10

x(2x-5)-2(2x-5)=0 (2x-5)(x-2)=0 2x-5=0,x1=5/2 x-2=0,x2=2

x(2x-5)=4x-10 x(2x-5)=2(2x-5) 度娘上问数学题的真多, 家教都省了.

见图

x(2x-5)=4x-10 2x^2-5x=4x-10 2x^2-9x+10=0 x^2-9/2x+5=0 x^2-9/2x+81/16=1/16 (x-9/4)^2=(1/4)^2 x-9/4=±1/4 x=9/4±1/4, x1=9/4+1/4=2.5 x2=9/4-1/4=2

2x^2-5x=4x-10 2x^2-5x-4x+10=0 2x^2-9x+10=0 (x-2)(2x-5)=0 x=2或5/2

2X+10+30=4(X-5) 2X+10+30=4X-4*5 2X+40=4X-20 40+20=4X-2X 2X=60 X=30

x(2x-5)=4x-10 x(2x-5)=2(2x-5) x=2

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