* 1999 - 2000 + 2999 - 3000 + 3999 - 4000 + 4999 - 5000 + 5999 – 1000 Tìm X * X x 5 + 122 + 236 = 633 * 320 + 3 x X = 620 * 357 : X = 5 d­ 7 * X : 4 = 1234 d­ 3 * 120 - ( X x 3 ) = 30 x 3 * 357 : ( X + 5 ) = 5 d­ 7 * 65 : x = 21 d­ 2 * 64 : X = 9 d­ 1 * ( X + 3) : 6 = 5 + 2 * X x 8 - 22 = 13 x 2 * 720 : ( X x 2 + X x 3 ) = 2 x 3 * X+ 13 + 6 x X = 62 * 7 x ( X - 11 ) - 6 = 757 * X + ( X + 5 ) x 3 = 75 * 4 < X x 2 < 10 * 36 > X x 4 > 4 x 1 * X + 27 + 7 x X = 187 * X + 18 + 8 x X = 99 * ( 7 + X ) x 4 + X = 108 * ( X + 15 ) : 3 = 3 x 8 * ( X : 12 ) x 7 + 8 = 36 * X : 4 x 7 = 252 * ( 1+ x) +( 2 + x) + ( 3 + x) + ( 4 + x ) + ( 5 + x) = 10 x 5 * ( 8 x 18 - 5 x 18 - 18 x 3 ) x X + 2 x X = 8 x 7 + 24

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