Tính nhanh: \(A=20,13\times100+2013\times\frac{100}{50}+201,3:0,1+2,013:0,001\)
A tính nhanh : A = 20,13 nhân 1000 + 2013 nhân 100 phần 50 + 201,3 chia 0,1+ 2, 013 chia 0,001 B tính ( 1 - 1/4 ) nhân ( 1 - 1/9 ) nhân (1- 1/6 ) nhân ( 1- 1/25 ) nhân ( 1-1/36 ) giúp mik câu A và câu B
Ta có:A=20,13.100+2013.100/50+201,3:0,1+2,013:0,001
A=2013+2013.2+2013+2013
A=2013.(1+2+1+1)
A=2013.5
A=10065
Ta có:A=20,13.100+2013.100/50+201,3:0,1+2,013:0,001
A=2013+2013.2+2013+2013
A=2013.(1+2+1+1)
A=2013.5
A=10065
Tính nhanh ( 43 + 25% - 4325 : 100) * 2013 *2012 +20,13 : 0,01
99,4 x 20,13 + 0,06 x 201,3 =
Tính:
\(A=\frac{1^2}{1\times2}\times\frac{2^2}{2\times3}\times\frac{3^2}{3\times4}\times...\times\frac{99^2}{99\times100}\times\frac{100^2}{100\times101}\)
Ta có:
\(A=\frac{1^2}{1.2}.\frac{2^2}{2.3}.\frac{3^2}{3.4}...\frac{99^2}{99.100}.\frac{100^2}{100.101}\)
\(=\frac{1}{2}.\frac{4}{6}.\frac{9}{12}....\frac{9801}{9900}.\frac{10000}{10100}\)
\(=\frac{1}{2}.\frac{2}{3}.\frac{3}{4}...\frac{99}{100}.\frac{100}{101}=\frac{1.2.3...99.100}{2.3.4...100.101}=\frac{1}{101}\)(Tối giản)
tinh bang cach nhanh nhat
(43+25%-4325:100)*2013*2012+20,13:0,01
tìm y biết
20,13<y+y+y+ .....................+y<201,3
có 20 số y
Tính nhanh
\(\frac{19,01\div0,1\times\left(208\times9+208\right)}{2,08\times100\div0,01}\)
\(\frac{19,01\div0,1\times\left(208\times9+208\right)}{2,08\times100\div0,01}\)
\(=\frac{190,1\times\left(208\times9+208\times1\right)}{208\div0,01}\)
\(=\frac{190,1\times\left[208\times\left(9+1\right)\right]}{20800}\)
\(=\frac{190,1\times\left[208\times10\right]}{20800}\)
\(=\frac{190,1\times2080}{20800}\)
\(=\frac{190,1\times10\times208}{100\times208}\)
\(=\frac{1901}{100}\)
\(\frac{19,01\div0,1\times(208\times9+208)}{2,08\times100\div0,01}\)
\(=\frac{19,01\div\frac{1}{10}\times(208\times9+208\times1)}{208\div\frac{1}{100}}\)
\(=\frac{19,01\times10\times\left[208\times(9+1)\right]}{208\times100}\)
\(=\frac{19,01\times100\times208\times10}{208\times100}=19,01\times10=190,1\)
tìm số y lớn nhất biết
20,13 < y + y + ... +y < 201,3 (tổng bằng y + 20 x y)
Bai 1:Tinh nhanh: 20,15*100+20,15+20,15:0,1+2,015:0,001