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20 1 1 how to do the seventh multiple-choice question in the college entrance examination of mathematics and science in Shandong province?
For linear programming problems, this equation must pass the average value of x and y.

Given that b is 9.4, substitute the average value of x 3.5 and the average value of y 42.

It is not difficult to get that A is 9. 1.

If x is 6, y should be 65.5.

Choose B.

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