tính nhanh: 2016.(-2015 +1) -2015 . (1.2016)
1,Tính nhanh
[2015*2015*2014-2014-2014*2015]*[2016*2016+2015*2015*2016]
1 Tính nhanh
2015 - ( 403.5 - 2016) - 2016 + 2^2017 : 2^2015 - 2^2015:4^1007-1-3+4-5-6+11
=2015-(2015-2016)-2016+22017-2015-22015/22014-(1-4)-3-(5+6)+11
=(2015-2015)+(2016-2016)+22-2+3-3-11+11
=0+0+(4-2)+(3-3)-(11-11)
=2
tính nhanh (2015+2014*2016)/(2015*2016-1)
ai nhanh mình k nhưng phải đúng và trình bày nha
\(\frac{2015+2014\cdot2016}{2015\cdot2016-1}\)
\(=\frac{2015+\left(2015-1\right)2016}{2015\cdot2016-1}\)
\(=\frac{2015-2016+2015\cdot2016}{2015\cdot2016-1}\)
\(=\frac{2015\cdot2016-1}{2015\cdot2016-1}\)
\(=1\)
Tính nhanh
2015*3+2015*6+2015=
2016*111-11*2016=
Tính nhanh nha các bạn hi
= 2015 x ( 3 + 6 + 1 )
= 2015 x 10
= 20150
2016 x ( 111 - 11 )
= 2016 x 100
= 201600
tk mình nhé
thank you very much
bye bye
2015x3+2015x6+2015
= 2015 x ( 3+6+1 )
= 2015 x 10
= 20150
2016x111-11x2016
= 2016 x ( 111-11)
= 2016x100
= 201600
2015*3 + 2015*6+ 2015 2016* 111- 11* 2016
=2015*( 3+6+1) = 2016*( 111-11)
=2015* 10 = 2016* 100
= 20150 = 201600
tk cho mk nhe
Tính nhanh nếu có thể
a. 2017/2016 nhân 3/4 trừ 1/2016 nhân 0,75
b.1/2 nhân 2015/2016 cộng 1/3 nhân 2015/2016 trừ 2015/2016 nhân 5/6
a)\(=\frac{2017}{2016}.\frac{3}{4}-\frac{1}{2016}.\frac{3}{4}\)
\(=\frac{3}{4}\left(\frac{2017}{2016}-\frac{1}{2016}\right)\)
\(=\frac{3}{4}.1\)
\(=\frac{3}{4}\)
b)\(=\frac{2015}{2016}\left(\frac{1}{2}+\frac{1}{3}-\frac{5}{6}\right)\)
\(=\frac{2015}{2016}.0\)
\(=0\)
Tính nhanh 2016 . 2015 - 1 / 2014 . 2015 + 4029
\(\frac{2016\cdot2015-1}{2014\cdot2015+4029}\)
\(=\frac{2014\cdot2015+2015\cdot2-1}{2014\cdot2015+4029}\)
\(=\frac{2014\cdot2015+4030-1}{2014\cdot2015+4029}\)
\(=\frac{2014\cdot2015+4029}{2014\cdot2015+4029}=1\)
Tính nhanh : \(\frac{2017+\frac{1}{2016}+\frac{2}{2015}+\frac{3}{2014}+...+\frac{2015}{2}+\frac{2016}{1}}{\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{2015}+\frac{1}{2016}}\)
Tính nhanh:
500.(4-124)-124.(-500) 2016.(-2015+1)-2015.(1-2016)=(-2015.2016+2016.1)-(2015.1-2015.2016)
=-2015.2016+2016-2015+2015.2016
=2016(-2015+2015)+(2016-2015)
=2016.0+1
=0+1
=1
2016.(-2015+1)-2015.(1-2016)=2016-2016.2015+2015.2016-2015=(2015.2016-2016.2015)+(2016-2015)=1
tính nhanh : ( 2013 x 2014 + 2014 x 2015 + 2015 x 2016 ) x ( 1 + 1/3 - 1 và 1/3 )
( 2013 x 2014 +2014 x 2015 + 2015 x 2016 ) x ( 1 + 1/3 - 1 - 1/3 )
= ( 2013 x 2014 + 2014 x 2015 + 2015 x 2016 ) x 0
= 0