Quy đồng mẫu các phân thức sau: 1/2x; 5/(10x+10); (x+7)/ (5x^2+5x)
Giải thích
10x+10=10x+1; 5x2+5x=5xx+1
MTC: 10xx+1
12x =5x+12x.5x+1=5x+510xx+1
510x+10=510x+1=5.x10x+1.x=5.x10x.x+1
x+75x2+5x=x+75xx+1=x+7.25xx+1.2=2x+1410xx+1
10x+10=10x+1; 5x2+5x=5xx+1
MTC: 10xx+1
12x =5x+12x.5x+1=5x+510xx+1
510x+10=510x+1=5.x10x+1.x=5.x10x.x+1
x+75x2+5x=x+75xx+1=x+7.25xx+1.2=2x+1410xx+1