2 次の式を因数分解しなさい。 (1) 7a²x-56ax+112x (3) 25x² +10xy+y²-16 (5) 27x³y-90x³y² +75.xy³ (7) bx²-2-by+x²-bz-y (9) 3r²y²-18r²y+24x² (11) 4a²-12ab+2ac-3bc+96² (13) 54a²+72ax+24x² 15) 2x²-3xy-2x+9y-12 8TXT 180 (2) a²b-b²+b_a² DEX18 (217 (4) 4ax²-8axy-96ay² (6) x²+2xy-2x+4y-8 (8) -16y² +100x² (10) x²-3xy-10y²+x-5y (12) 4ax³ +12a²x²-40a³ x (14) 25x²-40ax+16a² −5x+4a (16) 288ab³c-200abc³ 81X8S (10 a.erxa.08 (0) S) 4 82