\(=\frac{1}{2}\times\frac{2}{3}\times\frac{3}{4}\times\frac{4}{5}=\frac{1\times2\times3\times4}{2\times3\times4\times5}=\frac{1}{5}\)
\(=\frac{1}{2}\times\frac{2}{3}\times\frac{3}{4}\times\frac{4}{5}=\frac{1\times2\times3\times4}{2\times3\times4\times5}=\frac{1}{5}\)
1) 1/3 x 1/2 x 3/7 2) 5/4 x 1/3 + 1/7 3) 8 x ( 8/9-2/3 ) 4) 5/6 x 48/20 x 1/2 5) ( 2/5 + 3/4 ) x 8 6) 10 x ( 1/2-1/5 )
Bài 299: Tính
1) 1/3 x 1/2 x 3/7
2) 5/4 x 1/3 + 1/7
3) 8 x ( 8/9-2/3 )
4) 5/6 x 48/20 x 1/2
5) ( 2/5 + 3/4 + x 8
6) 10 x ( 1/2 - 1/5 )
Trình bày rõ cách làm giúp ạ!!
Bài 2:
a) ( 1/4 :5 x 1/3 x 1/4 ) : ( 2/3 + 1/5 :4 )
b) ( 3/4 :5 + 1/2:3/5 ) x ( 4/5 + 1/3 x2 )
Tính nhanh
1/1 x 2 + 1/ 2 x 3 + 1/ 3 x 4 + 1/ 4 x 5 + 1/ 5 x 6 + 1/ 6 x 7 + 1/ 7 x 8.
35 nhan x + 1/2 : 5/3 - 5/4 = 1/2 x 1/3
3/5 nhan x + 1/2 : 5/3 - 5/4 = 1/2 x 1/3
Bài 299: Tính
1) 1/3 x 1/2 x 3/7
2) 5/4 x 1/3 + 1/7
3) 8 x ( 8/9-2/3 )
4) 5/6 x 48/20 x 1/2
5) ( 2/5 + 3/4 ) x 8
6) 10 x ( 1/2-1/5 )
Trình bày rõ cách làm giúp nhen!!
x+1/16=1/3-1/4
x-5/12=1/3+1/4
x+1/2=4/5
x-1/6=1/2+1/3
x+1/8=1/2-1/3
bài tìm x
Bài 1 : tính giá trị của biểu thức
1/2 x 3/4 : 4/5
2/3 + 1/6 - 1/2
3/5 + 4 : 2/3 - 3/2
2 tìm x
x - 1/4 = 1/2
2/3 + x = 1
2/9 nhân x 6/15 : 4/5
3/5 :x = 1/7
a) (1 - 1/2) x (1 - 1/3) x (1 - 1/4) x (1 - 1/5) x (1 - 1/6)
b) (1 - 1/2) x (1 - 1/4)x...x (1 - 1/2019) x (1 - 1/2020)