(-3x+2y)(3x+2y)

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(-3x+2y)(3x+2y)
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(-3x+2y)(3x+2y)
(-3x+2y)(3x+2y)

(-3x+2y)(3x+2y)
原式=(2y-3x)(2y+3x)
=(2y)²-(3x)²
=4y²-9x²

(2/5-1/3)/ 5/6
=(6/15-5/15)/(5/6)
=1/15×6/5
=2/25
7.5+2.5/0.5
=7.5+5
=12.5
(4/5-2/3)/(1/2+2/3)
=(12/15-10/15)/(3/6+4/6)
=(2/15)/(7/6)
=2/15×6/7
=4/35

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