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Đi Tìm x,y biết B1: a₁ 12-3x | +5 = x = 7 6₁ 1x-31 + [x = 4/= 2+1 16-2x1=5 C, 12-3xl d₁ 4+2 +3 + e, 2+4 +6 + f₁ 1-3 tx E820 (EN) + 2x = 240 CxEN) + 2x + 32 + ? --- g₁ (x+1)+ (x + 2) + (x + 3) + 1 ㅗ + + + 5-7 3.5 t 20111 - 20:2-2015 ... + (x+ 100) = 5070 1 4 - 49 99 (2x-1)-(2x+1)