Câu 4. Tìm X
a) X x 17,7 – 7,7 x X = 177
b) 9 x (12 – 2 x X) = 54
c) X x 3,9 + X x 0,1 = 16
d) 1,23 : X – 0,45 : X = 1,5
e) (X - 1/3) x 5/3 = 14/27 - 3/9
l) (12 x 15 – X) x 1/4 = 120 x 1/4 g) 17/5 : X = 34/5 : 4/3
h) X : 4/5 = 25/8 : 5/4
i) (X x 0,25 + 2012) x 2013 = (50 + 2012) x 2013
k) (X - 1/2) x 5/3 = 7/4 - 1/2
Loga
Sinh Học lớp 12
