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Several problems in summer vacation homework of seventh grade new thinking mathematics: 1. (2A+3B- 1) (2A-3B+ 1) 2。 (3Y- 1) (2Y-3)+(6Y-5) (Y-4)。
1..(2a+3b- 1)(2a-3b+ 1)

=[2a+(3 b- 1)][2a-(3 b- 1)]

=4aa-(3b- 1)(3b- 1)

=4aa-9bb+6b- 1

2.(3y- 1)(2y-3)+(6y-5)(y-4)

= 6yy- 1 1y+3+6yy-29y+20

= 12yy-40y+23

3.(x- 1)(x+3)-x(x-2)

=xx+2x-3-xx+2x

=4x-3

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