2x31x12+4x6x42+8x27x3
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
phần 1 = 24 x (31+42+27)=24 x 100=2400
phần 2 = (36 x (28+82)) + (64 x (69+41)) = (36x110) + (64x110) = 110 x (36+64) = 110x100=11000
![](https://rs.olm.vn/images/avt/0.png?1311)
a, \(2.31.12+4.6.42+8.27.3=24.31+24.42+24.27=24.\left(31+42+27\right)=31.100=3100\)
b, \(36.38+36.82+64.69+64.41=36.120+64.110=11360\)
a) \(2.31.12+4.6.42+8.27.3\)
\(=\)\(\left(2.12\right).31+\left(4.6\right).42+\left(8.3\right).27\)
\(=\)\(24.31+24.42+24.27\)
\(=\)\(24.\left(31+42+27\right)\)
\(=\)\(24.100\)
\(=\)\(2400\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a)Chịu
b)(68x8686 - 6868x86) xA = {[68x(86x101)] - [(68x101)x86]} xA =[(68x86x101) - (68x101x86)] xA = 0 xA = 0
a) 2 x 31 x 12 + 4 x 6 x 42 + 8 x 27 x 3
= ( 2 x 12 ) x 31 + 24 x 42 + ( 8 x 3 ) x 27
= 24 x 31 + 24 x 42 + 24 x 27
= 24 x ( 31 + 42 + 27 )
= 24 x 100
= 2400
b) ( 68 x 8686 - 6868 x 86) x ( 1 + 2 + 3 + ... + 2016 )
= ( 68 x 86 x 101 - 68 x 101 x 86 ) x ( 1 + 2 + 3 + ... + 2016 )
= 0 x ( 1 + 2 + 3 + ... +2016 )
= 0
![](https://rs.olm.vn/images/avt/0.png?1311)
2*31*12+4*6*41+8*27*3
= 24 *31 + 24 *41 + 24 * 27
= 24*( 31+41+27)
=24 * 99
=2376
![](https://rs.olm.vn/images/avt/0.png?1311)
=(2x12)x31+(4x6)x12+(8x3)x27
=24x31+24x12+24x17
=24x(31+27+12)
=24x70
=1680
![](https://rs.olm.vn/images/avt/0.png?1311)
2x31x12+4x6x42+8x27x3
=(2x31x12)+(4x6x42)+(8x27x3)
=(24x31)+(24x42)+(24x27)
=24x(31+42+27)
=24x100
=2400
![](https://rs.olm.vn/images/avt/0.png?1311)
\(2.31.12+4.6.41+8.27.3\)
\(=24.\left(31+41+27\right)\)
\(=24.99\)
\(=2376\)
\(2.31.12+4.6.41+8.27.3=24.31+24.41+24.27\)
\(=24.\left(31+41+27\right)=24.99=24.\left(100-1\right)\)
\(=24.100-24=2400-24=2376\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) Sửa đề: C/m tứ giác BEHC nội tiếp
Xét tứ giác BEHC có
\(\widehat{BEC}=\widehat{BHC}\left(=90^0\right)\)
\(\widehat{BEC}\) và \(\widehat{BHC}\) là hai góc cùng nhìn cạnh BC
Do đó: BEHC là tứ giác nội tiếp(Dấu hiệu nhận biết tứ giác nội tiếp)
=24*31+24*42+24*27
=24(31+42+27)
=24*100
=2400
\(2\times31\times12+4\times6\times42+8\times27\times3\)
\(=\left(2\times12\right)\times31+\left(4\times6\right)\times42+\left(8\times3\right)\times27\)
\(=24\times31+24\times42+24\times27\)
\(=24\times\left(31+42+27\right)\)
\(=24\times100\)
\(=2400\)