Tính nhanh: 123,45 + 23,56 + 76,44 + 54,55
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 237 + 2456 + 1763 + 544 = 5000
b, 123,45 + 23,56 + 76,44 + 54,55 = 278
![](https://rs.olm.vn/images/avt/0.png?1311)
123,45 + 23,56 +76,44 + 54,55
= (123,45 + 54,55) + (23,56 + 76,44)
= 178 + 100
= 278
456 x 45 + 456 x 10 + - 456 x 55
=456 x (45 +10-55)
=456 x 0
=0
2,5 x 8,5 + 7,5 x 8,5
=8,5 x (2,5 +7,5)
= 8,5 x 10
= 85
86 x 5 + 86 x 4 + 86
= 86 x (5+4+1)
= 86 x10
860
![](https://rs.olm.vn/images/avt/0.png?1311)
123,45 - 67,89 - 23,45
= ( 123,45 - 23,45 ) - 67,89
= 100 - 67,89
= 32,11
Mk nhanh nhất đó
123,45 - 67,89 - 23,45 =
(123,45 - 23,45) - 67,89 =
100 - 67,89=
32,11
![](https://rs.olm.vn/images/avt/0.png?1311)
13,04 + 23,56 + 46,96 =
(13,04 + 46,96 ) + 23,56=
60 + 23,56 =
83,56
kick mik nha mọi người
thank you very much
(^_^)~~~~~~~~~~
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(123,45:0,5+123,45+0,2+123\times3\)
\(=123,45\times2+123,45\times5+123,45\times3\)
\(=123,45\times\left(2+5+3\right)\)
\(=123,45\times10\)
\(=1234,5\)
123,45:0,5+123,45:0,2+123x3
=123,45:\(\frac{1}{2}\)+123,45:\(\frac{1}{5}\)+123x3
=123,45 x 2+123,45 x 5 +123x3
=123,45x(2+5) +123x3
=123,45x7+123x3
=123x7 +0,45x7 +123x3
=123x(7+3)+0,45x7
=123x10+0,45x7
=1230+ 3,15
=1233,15
![](https://rs.olm.vn/images/avt/0.png?1311)
123,45 x 0,5 + 768,65 x 1/2
= 123,45 x 0,5 + 768,65 x 0,5
= 0,5 x (123,45 + 768,65)
= 0,5 x 892,1
= 446,05
![](https://rs.olm.vn/images/avt/0.png?1311)
Tính nhanh: 123,45 + 23,56 + 76,44 + 54,55
= (123,45 + 54,55) + (23,56 + 76,44)
= 178 + 100
=278
123,45 + 23,56 + 76,44 + 54,55 =
(123,45 + 54,55) + (23,56 + 76,44) =
178 + 100 = 278