bài 1
a; 5/11 + 11/29 +c6/11 +18/29 - 1/2
b' 9/10 x 10/19 - 9/10 x 11/29 - 0,5c; 4/7 - 3/7 ( 2/3 -5/4)d; | 1/2 -3/4 | + 2/3 [ căn 9/16 - ( -5/11 ) + 1/2 ]
bài 2
a; 2x -1/2 = 3/4 b 2/5 |x| +1/2 =21/5 c 2-x/4 =16/2d ( 2x-1)=9
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