/a, 3/7x+2 3/8=1 2/5
b, x-3/10=7/15.3/5
c 2019x(x-2019/2020)=0
/a, 3 3/7.x+4/7=-4/5
b, 1/3-2/5+3x=3/4
c,(3/7x-7/5).(6-9/10)=0
/a, 2 1/4.x-9 1/4=20
b -1/4-3/4÷x=-11/36
c (2/3x-4/9).(1/2+-3/7÷x)=0
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Sinh Học lớp 12
