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Please add brackets to the wrong formula: 1 + 2x3 + 4x5 + 6x7 + 8x9 = 479 to make the formula hold positive solution: ()
1+2×（3+4×5+6）×7+8×9=479
1/2X3/4X5/6X7/8X9/10…… Is there any rule for 99 / 100?
Can help me write out the process of solving the problem and the number of the best
A=1/2X3/4X5/6X7/8.X99/100
Suppose a number B
B=2/3X4/5X6/7X8/9.X98/99
Then AXB = 1 / 100
And 1 / 100 = 1 / 10x1 / 10
Because b > A,
So b > 1 / 10
Then a < 1 / 10
This can only be a simple judgment, it is difficult to calculate the accurate data
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