(3-4y)(4y+3)+(-3-4y)^2等于?
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(3-4y)(4y+3)+(-3-4y)^2等于?
(3-4y)(4y+3)+(-3-4y)^2等于?
(3-4y)(4y+3)+(-3-4y)^2等于?
您好:
(3-4y)(4y+3)+(-3-4y)^2
=(3-4y)(4y+3)+(3+4y)^2
=(3+4y)(3-4y+3+4y)
=6(3+4y)
=18+24y
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等于24y+18
(3-4y)(3+4y)=3²-(4y)² (-3-4y)²=(-3)²+24y+(4y)² 两者相加得18+24y
(3-4y)(4y+3)+(-3-4y)^2
=12y+9-16y^2-12y+9+24y+16y^2
=9+9+24y
=18+24y
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祝学习进步
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