A=1/2-3/4+5/6-7/12
B=(12/35-6/7+18/4):6/-7-(-2/5)-1
C=(53/4-2 5/27-65/6):230+1/25)+46 3/4
D=(-5/7-7/9+9/11-11/13)×(3-3/4)
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(10/21+14/27-6/11+22/39):(2-2/3)
Ai giải hết giúp mình , mình sẽ chi 20 xu .CẢM ƠN