tính nhanh: 9876543*9876545 - 9876544^2
Tính nhanh
9876543 x 9876545 - 98765442
\(9876543.9876545-9876544^2\)
\(=\left(9876544-1\right)\left(9876544+1\right)-9876544^2\)
\(=\left(9876544^2-1\right)-9876544^2\)
\(=9876544^2-1-9876544^2\)
\(=-1\)
9876543 x 9876545 - 98765442
= 9876543 x ( 9876544 + 1 ) - 9876544 x 9876544
= 9876543 x 9876544 + 9876543 - 9876544 x ( 9876543 + 1 )
= 9876543 x 9876544 + 9876543 - 9876544 x 9876543 - 9876544
= - 1
So sánh A= 1234567 x 1234568 - 1234566 x 1234569
B= 9876543 x 9876544 - 9876542 x 9876545
\(A=1234566\cdot1234568+1234568-1234566\cdot1234568-1234566\)
\(=1234568-1234566\)
\(=2\)
\(B=9876542\cdot9876544+9876544-9876542\cdot9876544-9876542\)
\(=9876544-9876542\)
\(=2\)
Vậy \(A=B\)
1234567+9876543=???????
Ai nhanh mình tick!!!!!!
9876543.9876545-98765442
\(9876543.9876545-9876544^2\)
\(=9876543.9876545-9876544.9876544\)
\(=9876543.\left(9876544+1\right)-9876544.9876544\)
\(=9876543.9876544+9876544.9876544+9876544.1\)
\(=9876544.\left(9876543+1\right)+9876544.9876544\)
\(=\left(9876544+9876544\right)^2\)
\(=19753088^2\)
9 876 543 . 9 876 545 - ( 9 876 544 )2
= ( 9 876 544 - 1 )( 9 876 544 + 1 ) - ( 9 876 544 )2.1
= [ ( 9 876 544 )2 - 12 ] - ( 9 876 544 )2
= ( 9 876 544 )2 - 1 - ( 9 876 544 )2
= -1
2+ 2^ 3+ 9876543^0 + 2^2 = ?
giải đi mik tik cho
2 + 23 + 98765430 + 22 = 2 + 8 + 1 + 4 = 15
2+23+98765430+22=2+8+1+4=15
bn cho mik rùi mik k lại choa nha!
234567+9876543+109238=?
234567 + 9876543 + 109238 = 1330348
k mk nha ^_^
234567+9876543+109238=1330348
k mk nha! mk k lại cho
987654321-98765432-9876543-.....-9=
So sánh A và B biết :
A=9876548*9876544
B=9876546*9876546
123456 + 98765 - 123456 + 9876543 -12345698
123456 + 98765 - 123456 + 9876543 -12345698=-2370390
Tk nha
=-248180 nha bạn
Chúc bạn học giỏi tk mình chứ