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x 5.25=2 5x

x+ 5.25=2+ 5x = 5.25-2=5x-x = 4x=3.25 = x=0.8125

不对。 5x=25 x=25/5 =5 x+5 =5+5 =10

望采纳

x除以2-25=47点5-2点5x怎么算? x÷2-25=47.5-2.5x 0.5x-25=47.5-2.5x 3x=72.5 x=145/6

 3.8x5.25 +14.5x0.2 =19.95+2.9 =22.85 没有简算,直接计算

5x=25.5-13,5x=12.5,x=12.5除以5,x=2.5

根据题意得:(2x-5)x=2-25(x-5x2),去括号得:2x2-5x=2-25x+2x2,移项合并得:235x=-2,解得:x=-1023.

(2/5)x + 0.2 = (18/25)X5, (2/5)x + 0.2 = 18/5, 2x + 1 = 18, 2x = 17, x = 8.5,

圆x2+y2-10x-10y=0 ==> (x2-10x+25)+(y2-10y+25)=50 ==> (x-5)2+(y-5)2=50 即,圆心O1(5,5),半径为5√2 元x2+y2-6x+2y-40=0 ==> (x2-6x+9)+(y2+2y+1)=50 ==> (x-3)2+(y+1)2=50 即,圆心O2(3,-1),半径也是5√2 R1=R2=5√2,是两个等圆圆心距O1O2=...

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