2(x-y)-a(x-y)
=(2-a)(x-y)
Chúc bạn học tốt!
Đáp án:
`=(x-y)(2-a)`
Giải thích các bước giải:
` 2(x-y)-a(x-y)`
Phương pháp làm là áp dụng tính chất: `ab+ac =a(b+c)`
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