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0.2x2 0.2x 5解方程

0.2*2+0.2X=5 解:0.4+0.2X=50.2X=5-0.40.2X=4.6 X=4.6÷0.2 X=23

..0.2

0.2*2+0.2x=5 解 0.4+0.2x=5 0.4+x=5÷0.2 0.4+x=25 0.4x=25 x=25÷0.4 x=62.5

是不是:0.2x(X一5)=2怎样解方程∴0.2x(X一5)=2 ∴X-5=10→X=15

解:0.4+0.2X=5 0.2x=50.4 X=4.6÷0.2 X=23

0.2*5+0.2x=51+0.2x=50.2x=4x=20

0.2x-5=(3/2)x2x-50=15x2x-15x-50=0x=[15±√(225+400)]/4=(15±25)/4所以x=-5/2或x=10

即: 1/2 x - 3/2 x =5 -(3/2 -1/2 ) =5 x= - 5

0.2x^2十5=3x/20.2x^2-1.5x十5=0(-1.5)^2-4*0.2*5=2.25-4=-1.75小于0方程无解

0.2x^2+5=3x/22x^2-15x+50=0△=225-400 评论0 0 1

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