Tính bằng cách thuận tiện nhất
2017 * 3 + 2017 * 31 + 2017 * 67 - 2017
Ai nhanh và đúng mik tick cho
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2017*4+2017*62+2017*35-2017
=2017*(4+62+35-1)
=2017*100
=201700
2006*42+2006*39+2006*21-2006*2
=2006*(42+39+21-2)
=2006*100
=200600
k mik đi
b: =15/31(34/63-11/21)=15/31x1/63=5/651
a: \(=\dfrac{67}{63}\cdot5+\dfrac{11}{31}\cdot\dfrac{5}{7}=5\left(\dfrac{67}{63}+\dfrac{11}{31\cdot7}\right)=\dfrac{10880}{1953}\)
a)67/63 x 15/3 + 15/31 x 11/21
Thiếu đề
b)15/31 x 34/63 - 11/21 x 15/31
=15/31 x ( 34/63 -11/21)
= 15/31 x 1/63= 5/651
b: =15/31(34/63-11/21)=15/31x1/63=5/651
a: \(=\dfrac{67}{63}\cdot5+\dfrac{11}{31}\cdot\dfrac{5}{7}=5\left(\dfrac{67}{63}+\dfrac{11}{31\cdot7}\right)=\dfrac{10880}{1953}\)
b: =15/31(34/63-11/21)=15/31x1/63=5/651
a: =67/63⋅5+11/31⋅5/7=5(67/63+11/31⋅7)=10880/1953
\(2018\cdot2018-2017\cdot2019\)
\(=2018^2-\left(2018-1\right)\left(2018+1\right)\)
\(=2018^2-\left(2018^2-1\right)\)
\(=2018^2-2018^2+1\)
\(=1\)
\(2018.2018-2017.2019\)
\(=2018^2-\left(2018-1\right)\left(2018+1\right)\)
\(=2018^2-\left(2018^2-1\right)\)
\(=2018^2-2018^2+1\)
\(=1\)
a: \(=167\cdot\dfrac{67}{1000}+167\cdot\dfrac{33}{1000}=167\cdot\dfrac{1}{10}=\dfrac{167}{10}\)
2016 x 101 – 2016
= 2016 x 101 – 2016 x 1
= 2016 x ( 101 -1)
= 2016 x 100
= 201600
= 54 x 997 + 54 x 2 + 998 + 54 x1
= 54 x ( 997 + 2 + 998 + 1)
= 54 x 1998
= 107 892
Có gì sai tthongg cảm nó!
5x25x2x8x199x4x125
=(5x2)x(25x4)x(8x125)x199
=10x100x1000x199
=1000000x199
=199000000
5x25x2x8x199x4x125
=(5x2)x(25x4)x(8x125)x199
=10x100x1000x199
=1000000x199
=199000000
2017 x 3 + 2017 x 31 + 2017 x 67 - 2017 = 2017 x ( 3 + 31 + 67 - 1 )
= 2017 x 100
= 201700
tk mk nha
= 2017 *(3+31+67)-2017
=2017 * 101 - 2017
=201700