1/2.x+3/5.x-3/5.2=3
=>11/10.x=3+6/5
=>11/10.x=21/5
=>x=42/11
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Bài 1:
555 - 5 x [ 409 - (2 mũ 3 x 3 - 21) mũ 2 - 310]
Bài 2:
a) 10x +187 = 617 mũ 10 : 617 mũ 9
b) 5 mũ 2 + x = 25 mũ 4
c) (2x + 17) chia hết (x + 4)
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