Hãy tính phép tính sau bằng cách nhanh nhất: (89,9 x 999,9 x 9,89 + 61,16) x (7,8 x 7,779 - 3,9 x 2 x 2,593 x 3)
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a) 0,63 x 8 + 0,63 + 0,63 x 9,89
= 0.63 x ( 8+1+9.89 ) = 0.63 x 18.98 = 11.9
b) 9,89 x 99 + 9,89
= 9.89 x ( 99 + 1) = 9.89 x 100 = 989
a) 0,63 x 8 + 0,63 + 0,63 x 9,89
= 0,63 x 8 + 0,63 x 1 + 0,63 x 9,89
= 0,63 x ( 8 + 1 + 9,89 )
= 0,63 x 18,89
= 11,9007
b) 9,89 x 99 + 9,89
= 9,89 x 99 + 9,89 x 1
= 9,89 x ( 99 + 1 )
= 9,89 x 100
= 989
![](https://rs.olm.vn/images/avt/0.png?1311)
8,99 x 89,9 – 19,5 x 8,99 + 8,99 x 29,6
= 8,99 x ( 89,9 – 19,5 + 29,6)
= 8,99 x 100
= 899
![](https://rs.olm.vn/images/avt/0.png?1311)
8,99 x 89,9 – 19,5 x 8,99 + 8,99 x 29,6
= 8,99 x ( 89,9 – 19,5 + 29,6)
= 8,99 x 100
= 899
![](https://rs.olm.vn/images/avt/0.png?1311)
8,99 x 89,9 – 19,5 x 8,99 + 8,99 x 29,6
= 8,99 x ( 89,9 – 19,5 + 29,6)
= 8,99 x 100
= 899
![](https://rs.olm.vn/images/avt/0.png?1311)
8,99 x 89,9 – 19,5 x 8,99 + 8,99 x 29,6
= 8,99 x ( 89,9 – 19,5 + 29,6)
= 8,99 x 100
= 899
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2 x 3 x 4 x 8 x 50 x 25 x 125
= 3 x 2 x 4 x 50 x 8 x 25 x 125
= 3 x (2 x 50) x (4 x 25) x (8 x 125)
= 30 000 000.
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a)0,63 x 8 +0,63+ 0,63x 9,89
=0,63 x 8+0,63 x 1 +0,63 x 9,89
=0,63 x(8+1+9,89)
= 0,63 x 18,89
= 11,9001
b)9,89+99 x 9,89
=9,89x1+99x 9,89
=9,89 x(99+1)
=9,89 x 100
=989
k mk nha,chúc bn hok tốt!!!!!!!!
![](https://rs.olm.vn/images/avt/0.png?1311)
8,99x89,9-19,5x8,99+8,99x29,6
=8,99(89,9-19,5+29,6)=8,99x100=899
hok tốt nha
\(\left(89,9\times999,9\times9,89+61,6\right)\times\left(7,8\times7,779-3,9\times2\times2,593\times3\right)\)
\(=A\times\left(7,8\times7,779-3,9\times2\times2,593\times3\right)\)
\(=A\times\left(7,8\times7,779-7,8\times3\times2,593\right)\)
\(=A\times\left(7,8\times7,779-7,8\times7,779\right)\)
\(=A\times0=0\)