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Math problem! ! !
1, let the minuend be a08b and c43d. Because their difference is 658, and multiplier 1.2 times knows that B = 8 and D = 0, we can know that the minuend is 8088.

2.1.234a =1.23a+0.3a = 750 Correct result 925.5.

3. For the 2005th time, pour 1/2006 from Cup A into Cup B, and the water in Cup B is

1/2 * 2/3 * * 2005/2006 =1/2006, so the weight of a glass of water is 2005/2006.

4. Let x 1, x2 and x3 have x1=1/4 * (x2+x3+200), x2 = 2/7 * (x 1+x3+200), and x3 = 5/7.

Write so little first, then do it ~