A, 130 + = X 154 B, X + = 7 4C, 71 – 33 ( + X ) = 26 D, 140

Bài 5: Tìm x  Z , biết:

a, 130 + = x 154 b, x + = 7 4

c, ^{71 – 33} ( ^{+ x} ) ^{= 26 d, 140 :} ( ^{x – 8} ) ^{= 7}

e, ( ^{x + 2 . 7}

)

^{= 2.7}

^{f, x} −  + ^{ 42 (} − ^{28 ) }  = − ⁸

g, ^{4 3 –11}

^. ( ^x )

^{= 2 6 5 h, 7}

^{− 3.7}

^{= 7 .4}