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5x十9二200求x是多少

=2.5×12+2.5+0.9 =2.5×4×3+3.4 =10×3+3.4 =30+3.4 =33.4

44

5.5十5x=9 5x=9-5.5 5x=3.5 x=0.7 , 你好,本题已解答,如果满意 请点右下角“采纳答案”。

可以解得,几=1/2

52.5x2.9+5.45的简算过程 52.5x2.9+5.45的简算过程 52.5x2.9+5.45 =5.25x29+5.25+0.2 =5.25×(29+1)+0.2 =5.25×30+0.2 =157.5+0.3 =157.7

解:x十y=5m x一y=9m 得x=7m y=-2m 代入5x十7y=9得35m-14m=9.所以m=3/7. 如有疑问请追问,如果帮到你,请记得采纳,O(∩_∩)O谢谢

∵5x+3与-2x+9是相反数,∴5x+3-2x+9=0,3x=-12,解得x=-4,∴x2+x-10=(-4)2+(-4)-10=2故答案为:2.

1.5x=18 x=12

5×(口+9)-5×口-9=36

解:92.5*0.99+9.25 =92.5*0.99+9.25*1 =9.25*9.9+9.25*1 =9.25*(9.9+1) =9.25*10.9 =100.825

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