\(=\frac{1}{5}\times\frac{1}{3}\times\frac{3}{7}\times\frac{1}{2}\)
\(=\left(\frac{1}{5}\times\frac{1}{2}\right)\times\left(\frac{1}{3}\times\frac{3}{7}\right)\)
\(=\frac{1}{10}\times\frac{1}{7}\)
\(=\frac{1}{70}\)
\(=\frac{1}{5}\times\frac{1}{3}\times\frac{3}{7}\times\frac{1}{2}\)
\(=\left(\frac{1}{5}\times\frac{1}{2}\right)\times\left(\frac{1}{3}\times\frac{3}{7}\right)\)
\(=\frac{1}{10}\times\frac{1}{7}\)
\(=\frac{1}{70}\)
tinh nhanh
1/10 nhan 2/9 nhan 3/8 nhan 4/7 nhan 5/6 nhan 6/5 nhan 7/4 nhan 8/3 nhan 9/ 2
tinh nhanh 4/5 nhan 3/5 cong 4/5 nhan 6/7 tru 4/14 nhan 1/5
a, ( 11 nhan 9 - 100 + 1 ) : ( 1 nhan 2 nhan 3 nhan 4 nhan 5nhan 6 nhan 7 nhan 8 nhan 9 nhan 10)
Tinh nhanh
[1-1/2] nhan [1-1/3] nhan [1-1/4] nhan [1-1/5] nhan ...nhan [1-1/100]
lam tung buoc cho minh nhe
bai 3 : tim x
6 nhan ( x+9845 ) = 29042 nhan 6
(x chia 3) nhan 8 = 8 nhan 3198
bai 7 : tim x
191+ x + 9 = 43 nhan 5
x nhan 25 nhan 4 = 125 nhan 8
bai 8 : tim x
128 nhan x - 12 nhan x - 16 nhan x = 5208000
x nhan 27 + x nhan 30 + x nhan 43 =210500
2/5: 3/7 nhan 3/7 : 2/5 + 1999
{1- 1/2} nhan { 1 - 1/3} nhan { 1 - 1/4 } nhan { 1 - 1/5}
tinh nhanh 11/23 nhan 5-4 nhan 11/23 nhan 11/23
73 nhan 46+ 27 nhan 46
84 nhan 312+ 18 nhan 312
15 nhan 5 +15 nhan 6 -15 +100
x chia [9 nhan 6]=4
1 khu rung phong ho hcn co chieu rong 378m chieu dai gap 3 chieu rong tinh dien tich khu rung do
1, tinh nhanh
12 nhan 156 - 12 nhan 56
34 nhan 1123 -25 nhan 34 nhan34 nhan 100
lam ra cho minh luon nha