Mấy anh chị ơi giúp em với 5 sao ạ

Đáp án:

Giải thích các bước giải:

 `a) (12345xx67890-54321)/(12344xx67890+13569) = (12344xx67890+67890-54321)/(12344xx67890+13569) =(12344xx67890+13569)/(12344xx67890+13569)=1`

`b) (1996xx1997+1998xx3+1994)/(1997xx1999-1997xx1997)= (1996xx1997+1997xx3 + 3 + 1994)/(1997xx(1999-1997)) = ((1996+3)xx1997+1997)/(2xx1997) = (1999xx1997+1997)/(2xx1997) = (2000xx1997)/(2xx1997) = 1000`

`c) ((1+2+4+8+...+512)xx(101xx102-101xx101-50-51))/(2+4+8+16+...+1024+2048) = ((1+2+4+8+...+512)xx(101xx(102-101)-(50+51)))/(2+4+8+16+...+1024+2048)= ((1+2+4+8+...+512)xx(101-101))/(2+4+8+16+...+1024+2048)= ((1+2+4+8+...+512)xx0)/(2+4+8+16+...+1024+2048)=0/(2+4+8+16+...+1024+2048)=0`