tinh nhanh 2001+2002+1981+2003*21/2003*2002-2001*2002
Tính Nhanh :a/2001*2002+1981+2003*21/2002*2003-2001*2002
2001 . 2022 + 1981+2003 . 21/ 2002 . 2003 - 2001. 2002
= ( 2001. 2002 - 2001 . 2022 ) + ( 1981 + 2003 . 21/ 2002 . 2003)
= 0+( 1981 + ( 2003 . 21 / 2002 + 1)
= 0 + 1981+( 2002 . 21/2002+1+1)
= 1981 + ( 21+2)
= 1981+ 23
= 2004
Tính nhanh phân số :
2001 x 2002 + 2003 x 22 + 1980 / 2002 x 2003 - 2001 x 2002
Tinh nhanh
2003×14+1998+2001×2002 / 2002+2002×503+504×2003
Viet ro loi giai nhe! Ai nhanh mk tk cho!
2003x14+1998+2001x2002/2002+2002x503+504x2003 =2003x14+1998+2001x1+2002x503+504x2003 =2003x14+1998+2001+2002x503+504x2003 =28042+1998+2001+1007006+1009512 =(28042+1009512+1007006)+1998+2001 =2044560+1998+2001=2048559 TK MIk nha bn! mk tra loi dau tien ma ! Giu loi hua nhe!
2003 x 14 + 1988 + 2001 x 2002
=28042 + 1988 + 4006002
=4036032
2002 + 2002 x 503 +504 x 2002
=2002 x 1 + 2002 x 503 + 504 x 2002
=2002 x (1 + 503 + 504)
=2002 x 908
=1817816
ko quy đồg so sánh (2001+2002)/(2002+2003) và 2001/2002 + 2002/2003
Tham khảo :
Sứa , san hô , hải quỳ , thủy tức , sứa tu dài ,...
\(\dfrac{2001+2002}{2002+2003}< \dfrac{2001}{2002}+\dfrac{2002}{2003}\)
Tinh nhanh
2000/2001×2001/2003×2002/2004×2004+2000×2003/2095
Giai chi tiet nhe
tính nhanh: 2003*14+1988+2001*2002/2002+2002*503+504*2002
So Sánh :A=2001/2003 và B=2001+2002/2002+2003
2000/2001* 2002/2003* 2001/2002* 2003/2004*2006/2000
2000/2001 * 2002/2003 * 2001/2002 * 2003/2004*2006/2000
=((2000/2001).2002):2003.2001/2002).2003):2004.2006)/2000
=1.000998004
\(\dfrac{2000}{2001}\cdot\dfrac{2002}{2003}\cdot\dfrac{2001}{2002}\cdot\dfrac{2003}{2004}\cdot\dfrac{2006}{2000}=\dfrac{2006}{2004}=\dfrac{1003}{1002}\)
tinh nhanh
(7^2003+7^2002):7^2001
\(\left(7^{2003}+7^{2002}\right):7^{2001}\)
\(=\left(7^{2003}+7^{2002}\right).\frac{1}{7^{2001}}\)
\(=\frac{7^{2003}}{7^{2001}}+\frac{7^{2002}}{7^{2001}}\)
\(=7^2+7=49+7=56\)