254 x 399 -145 5932 + 6001 x 531
------------------------- --------------------------
254 + 399 x 253 5932 x 6001 - 69
Bài 4 :
x - 3/4 = 6 x 3/8 7/8 :x = 3 - 1/2 x + 1/2 x 1/3 = 3/4
Bài 5 :
3/2 x 4/5 - x = 2/3 x x 3 1/3 = 3 1/3 : 4 1/4 5 2/3 : x = 3 2/3 - 2 1/3
Bài 6 :
9 3 1 1 1
C = 5 ---- :----- - ( 2 -- x 4 --- - 2 x 2--- ) : 7/4
10 2 3 2 3
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