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x+75%x=49

x+75%x=49 解:1.75x=49 x=49÷1.75 x=28

25X49加75乘49简便运算 =(25+75)x49 =100x49 =4900

解:75×(□+4) =75×□+75×4 =75×□+300 (75×□+300)-(75×□+4) =75×□+300-75×□-4 =75×□-75×□+300-4 =300-4 =296 答:他得到的结果与正确的结果相差296.

x(8-x)=9.75 8x-x²-9.75=0 x²-8x+9.75=0 (x-6.5)(x-1.5)=0 x=6.5或x=1.5

解: X-50=75%X+75 X-50=0.75X+75 X-0.75X=75+50 0.25X=125 X=125÷0.25 X=500

x-0.75x=(54-x)-0.8(54-x) 0.25x=0.2(54-x) 0.25x+0.2x=0.2x54 x=0.2x54/0.45 =24 如有帮助请采纳, 如对本题有疑问可追问,Good luck!

500 把右边的减25移到左边变成50,把75%移到右边被85%减等于10%,50=10%x,所以x=500

这样

解: X(1+40%)×75%=X+150 X×1.4×0.75=X+150 1.05X=X+150 1.05X-X=150 0.05X=150 X=150÷0.05 X=3000

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