(2,0 ĐIỂM) TÌM X, BIẾT

Bài 2. (2,0 điểm) Tìm x, biết: a) 2 13 + x = −21 2x = − −2 3= − +x −x − −43= +6 67x = −6b) 3 1 1: 14 − 4 x = 43 1 54 − 4 : x = 41 3 54 :x = 4 − 44 :x 4 −41 :14x = −2x = 4 −2x = 4 ⋅ −

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5 − x − 2 = 25%

c)

3 13 1 255 − x − 2 = 1003 1 15 − x − 2 = 41 3 1x − = −2 5 41 7x − =2 20Trường hợp 1: Trường hợp 2: − =7 1x = +20 20x = + 1020x − 020 2017x = 20