so sanh a va b biet : A= 11x13x15+33x39x45+55x65x75+99x117x135/ 13x15x17+39x45x51+65x75x85+117x135x153 B=1111/1718
Minh can cac ban giai ho minh bai nay ! Cam on
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A=1995*1995 B=1994*1996
A=(1994+1)*1995 B=1994*(1995+1)
A=1994*1995+1*1995 B=1994*1995+1*1994
Vì 1994*1995=1994*1995 ; 1*1995 > 1*1994
Nên 1995*1995 > 1994*1996
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A>b
Cách làm: Bạn tách |B ra rồi so sánh với từng ps ở A, sau đó Kết luận
a<b nên -a>-b có 5>3 nên 5+(-a)>3+(-b) hay rút gọn được 5-a>3-b
1 LÌKEnhé
A lớn hơn B ( mình không chắc lắm nhé )
\(A=\frac{11\times13\times15+3\times\left(11\times13\times15\right)+5\times\left(11\times13\times15\right)+9\times\left(11\times13\times15\right)}{13\times15\times17+3\times\left(13\times15\times17\right)+5\times\left(13\times15\times17\right)+9\times\left(13\times15\times17\right)}\)
\(A=\frac{\left(11\times13\times15\right)\times\left(1+3+5+9\right)}{\left(13\times15\times17\right)\times\left(1+3+5+9\right)}\)
\(A=\frac{11}{17}>\frac{1111}{1718}\)