1 thuc hien phep tinh a) 1/2+(-3/4)+(-5/6) b) 7/15-(-8/5)+(-1/3) c) 8/9+(-5/6)+7/2
2 tinh a) [(1/8:8/27): -1/3 ] : 81/128 b) (-7/15) x 5 /8 - 15/-7 - (-32)
c) -66 x (1/2-1/3+1/11)+124-(-37)+63x(-124) 3 tim x a) 3/35-(3/5+x)=2/7 b) 3/7+1/7:x=3/14
giup mink bai nay duoc ko mik hua se vote 5* a cam on luy ko coppy mang ko coppy bai nguoi khac
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