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x的二倍%8与零点九的积差是二点4x是多少查看大图(...

2x-8×0.9=2.4 解:2x-7.2=2.4 2x=9.6 x=4.8

x/0.7+4.2=9.6 x/0.7 =5.4 x = 5.4*0.7 = 3.78

1.25×48×0.9 =1.25×8×6×0.9 =10×6×0.9 =60×0.9 =54

2.5*0.974*0.4=2.5*0.4=1*0.974=0.974

证法一:设x=0.9999999999999999999999999999…… 两边同时乘以10得 10x=9. 999999999999999999999999999……=9+x 故10x=9+x从而x=1 证法二:设x=0.9999999999999999999999999999…… =0.9+0.09+0.009+0.0009+…… 形成等比数列,公比为0.1 所以x=0.9/(...

x=0.52x=9.6 0.48x=9.6 x=20

设这个数是X 8x-5.5x=0.9 2.5x=0.9 x=0.9÷2.5 x=0.36

4+2/5-2.5+1.9X(0.5-0.5) =4.4-2.5+0 =1.9

设这个数是X 2x-12×0.75=0.9 2x-9=0.9 2x=0.9+9 2x=9.9 x=9.9÷2 x=4.95

你还是把题拍出来解答比较好, 4/9×63/32=7/8

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