=-20(x^2-70x+1225-225)这个方程怎么算就解下=-20(x-35)^2+4500了?这是一道数学题.

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=-20(x^2-70x+1225-225)这个方程怎么算就解下=-20(x-35)^2+4500了?这是一道数学题.

=-20(x^2-70x+1225-225)这个方程怎么算就解下=-20(x-35)^2+4500了?这是一道数学题.
=-20(x^2-70x+1225-225)这个方程怎么算就解下=-20(x-35)^2+4500了?
这是一道数学题.

=-20(x^2-70x+1225-225)这个方程怎么算就解下=-20(x-35)^2+4500了?这是一道数学题.
=-20(x^2-70x+1225-225)
=-20(x^2-70x+1000)
=-20((x-35)^2-35^2+1000)
=-20((x-35)^2-225)
=-20(x-35)^2+4500

=-20(x^2-70x+1225-225)
=-20(x^2-2*35*x+35^2-225)
=-20((x-35)^2-225)
=-20(x-35)^2+4500

=-20(x^2-70x+1225-225)
=-20【(x^2-35)平方-225】
=-20(x-35)^2+4500