Mathematics is getting higher and higher. - Training Enrollment Network

Mathematics is getting higher and higher.

I don't understand why the man above has to remove all 9 ~

Let three kinds of rice, A, B and C, be x, y and z kilograms respectively.

According to the equal number of good rice, middle rice and two meters, the formula is obtained:

4x+3y+2z=3x+y+z=2x+5y+z

x+y+z=350

The result is the same.

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