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Chapter 8 of the seventh grade next semester is urgent in mathematics! ! ! Detailed process! ! ! !
First, you have to set an unknown number.

Solution: Suppose one color band is X and the other is 40-X.

X2-40=(40-x)2 (assuming the length of the first color band here)

Solve equation X=20.5cm.

Other = 40-20.5 =19.5cm.

All in all, a-

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