tính nhanh :
a) 2017x34+2017x65+2017=
b) 2007-(0x3/4x1/4)=
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(1-1/2x1/2)x(1-1/3x1/3)x(1-1/4x1/4)x…x(1-1/2007x1/2007) = ( 1 - 1/4 ) x ( 1 - 1/9 ) x ( 1- 1/16) x .....x ( 1 - 1/4028049) = 3/4 x 8/9 x 15/16 x .....x 4028048 / 4028049 = 3 x 8 x 15 x .....x 4028048 / 4 x 9 x 16 x ......x 4028049 = 1 x 3 x 2 x 4 x 3 x 5 x .....x 2006 x 2008 / 2x2 x 3 x3 x 4 x 4 x .....x 2007 x 2007 = ( 1 x 2 x 3 x .....x 2006) x ( 3 x 4 x 5 x .....x 2008) / ( 2 x 3 x 4 x ....x 2007) x ( 2 x 3 x 4 x ....x 2007) = 2008 / 2007 x 2 = 1004 / 2007
(1-1/2x1/2)x(1-1/3x1/3)x(1-1/4x1/4)x…x(1-1/2007x1/2007)
= ( 1 - 1/4 ) x ( 1 - 1/9 ) x ( 1- 1/16) x .....x ( 1 - 1/4028049)
= 3/4 x 8/9 x 15/16 x .....x 4028048 / 4028049
= 3 x 8 x 15 x .....x 4028048 / 4 x 9 x 16 x ......x 4028049
= 1 x 3 x 2 x 4 x 3 x 5 x .....x 2006 x 2008 / 2x2 x 3 x3 x 4 x 4 x .....x 2007 x 2007
= ( 1 x 2 x 3 x .....x 2006) x ( 3 x 4 x 5 x .....x 2008) / ( 2 x 3 x 4 x ....x 2007) x ( 2 x 3 x 4 x ....x 2007)
= 2008 / 2007 x 2
= 1004 / 2007
Tính
a ) 1/2 x 1/4 x 1/6
= 1/8 x 1/6
= 1/48
b ) 1/2 x 1/4 : 1/6
= 1/8:1/6
3/4
c ) 1/2 : 1/4 x 1/6
= 2 x 1/6
= 1/3
tk mk nha ( nếu đúng )
hihi mơn nha !!!!!!!!!
3/4 x 1/2 x 4/5 x 2/3 : 1/5
=1/2 x 2/3 x 3/4 x4/5 : 1/5
=1 x 2 x 3 x 4 / 2 x 3 x 4 x 5 : 1/5
=1/5 : 1/5
=1
a) 2017 x 34 + 2017 x 65 + 2017
= 2017 x ( 34 + 65 + 1 )
= 2017 x 100
= 201700
b) 2007 - ( 0 x 3/4 x 1/4 )
= 2007 - 0
= 2007
Chúc bạn học tốt!
\(a)2017x34+2017x65+2017\)
\(=2017x\left(34+65+1\right)\)
\(=2017x100\)
\(=201700\)
\(b)2007-\left(0x\frac{3}{4}x\frac{1}{4}\right)\)
\(=2007-0\)
\(=2007\)
Chúc bạn học tốt !!!