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+ x =9.8÷2怎么解

0,5+2x二4.9,2x=4.4,x=2.2。答案是2.2

7.2:x=8/9 解:8x=7.2*9 8x=64.8 x=8.1 行家正解,不明白可以追问!祝您学习进步 满意请点击下面的【选为满意回答】按钮,O(∩_∩)O谢谢

x÷2+4.8=8.9 x÷2=4.1 x=8.2

化简得: 2X=4.9-0.5 X=2.2

3x + 8 = 2y + 9 (x, y为自然数) y = (3x-1)/2 由于y是自然数,所以(3x-1)是偶数; 所以3x是奇数; 所以x是奇数; 所以: x=2n-1 (n为自然数) y = (3x-1)/2 = (6n-3-1)/2 = 3n-2 即: x = 1, 3, 5, 7, 9, 11, 13, ... y = 1, 4, 7, 10,13,16, 19, .....

(9-X)×5/2=8 (9-X)=8×2/5 9-X=16/5 X=9-16/5 X=29/5

(0.5十x)十x=9.8÷2 0.5+x+x=4.9 2x=4.9-0.5 2x=4.4 x=2.2

2.9+8.1×x=27.5 解:8.1×x=27.5-2.9 8.1×x=24.6 x=24.6÷8.1 x=3又1/27

解:x=9.8/14 x=0.7

8/9-x=2/9 x=8/9-2/9 x=6/9 x=2/3

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