Đáp án:
a,3/4+1/4:x=2/5
1/4 : x=2/5 - 3/4
1/4 : x= (-7/20)
x=1/4 : (-7/20)
x= -5/7
Vậy x = -5/7
b,(-1)/4-3/4:x=(-11)/36
3/4 : x=(-1/4) - (-11/36)
3/4 : x= (-1/4) + (11/36)
3/4 : x= 1/18
x= 3/4 : 1/18
x= 27/2
Vậy x = 27/2
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