Mathematics
Junior High
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(3)๐ŸŸฉใฎABCDใŒๅ…ฅใฃใฆใ‹ใ‚‰่จˆ็ฎ—ใฎๆ„ๅ‘ณใŒๅˆ†ใ‹ใ‚‰ใชใใชใฃใฆใ—ใพใฃใŸใฎใงใ€ใใ‚Œใžใ‚ŒใŒไฝ•ใ‚’ใ—ใฆใ„ใ‚‹ใฎใ‹ๆ•™ใˆใฆใปใ—ใ„ใงใ™
ๅฑ•้–‹ๅ•้กŒ

(3)(x+y+z)+(x-y-z)-(-x+y-z)-(-x-y+z) =(x+y+z)(x+y=z)+(ใ‚ชใƒผy-2)ใƒผ(ไธ€xy+z) โ†“ = Aยฒ Bยฒยฒ + Cยฒ - Dยฒ 19 (A-B)(A+B)+(C-D)(C+P) = ใƒป2(x+z)2y+2(x-2)(-2) 4x4+4gz-4xg+4y=8yz

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