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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 8: phân tích thành nhân tử (phương pháp dùng hằng đẳng thức) 1,121-a^2 2,144a^2-81 3,196a^2-4b^2 4,25a^2-49b mũ 4 5,1/4a^2-b^2 6,4/9a mũ 4-25/4 7,(a-b)^2-c^2 8,(a-2b)^2-4b^2 9,(a-5b)^2-16b^2 10,25a^2-(a-b)^2 11,49a^2(2a-b)^2 { "@context": "https://schema.org", "@type": "QAPage", ...

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