I m sorry to explain which hero will help explain

A small bird was injured and landed on the windowsill.

I said, "Bird, it hurts!" Let me take you to heal, okay? ”

A hare was wounded and lay down next to a tree.

I said, "Little rabbit, you must hold on, and I will give you medicine to heal your wounds." You're sure to bounce back to health! ”

(1) (4950 4500) 9=50 (pieces) (2) Set the price of each piece to be at least X yuan.

50×4/5）120＋（50×1/5）x－4950≥6504800＋10x－4950≥650

150＋10x≥650

10x≥800

x 80 When the selling price is not less than 80 yuan, the profit will not be less than 650

There are 5 balls on the left, and 9 on the right are lighter than on the left, so meet 5 ? -9, ie? 14, and? -9 0, so? The interval range is 9 ? ＜14

So there are 5 cases of the original ball on the right: there may be 9, 10, 11, 12, 13 balls.

Probability of multiples of 2: 2 3

Multiples of 3 probability: 2 chunky pants 3

Multiples of both 2 and 3 may be 1 3

So Yan Bu Jian is fair.

Use the relevant formulas, principles, and formulas. Negative and negative add up to be negative. Negative and negative are subtracted, subtracting the large number is positive, and subtracting less than it is negative. The addition and subtraction of fractions is the same as the denominator, the addition and subtraction of the numerators, and the principle of plus and minus is the same as above.

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Let the number of eggs be x

Analysis: Take one by one and just finish it.

7 7 take it just right.

Explain that x is a multiple of 7.

2 2 take 1 left, 3 3 take 1 left, 4 4 take 1 left, 5 5 take 1 left, 6 6 take 1 left, 2, 3, 4, 5, 6) The least common multiple is 60

So x-1 is a multiple of 60.

Let x=60k+1 (k is a natural number).

Because x is a multiple of 7 and 56k is a multiple of 7, x-56k=4k+1 is a multiple of 7.

So learned; k=5，12，19，26……(add 7 in turn) so x=60k+1=301,721,1441......(add 420 in turn) if you ask for the smallest, it is: 301