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\(\dfrac{5}{13}\times\dfrac{7}{11}+\dfrac{5}{13}\times\dfrac{2}{11}+\dfrac{8}{13}\times\dfrac{9}{11}\)
\(=\dfrac{5}{13}\times\left(\dfrac{7}{11}+\dfrac{2}{11}\right)+\dfrac{8}{13}\times\dfrac{9}{11}\)
\(=\dfrac{5}{13}\times\dfrac{9}{11}+\dfrac{8}{13}\times\dfrac{9}{11}\)
\(=\dfrac{9}{11}\times\left(\dfrac{5}{13}+\dfrac{8}{13}\right)\)
\(=\dfrac{9}{11}\times1\)
\(=\dfrac{9}{11}\)
a) \(20,23\times21+20,23\times80-20,23\)
\(=20,23\times\left(21+80-1\right)\)
\(=20,23\times100\)
\(=2023\)
20,23 : 0,25 + 20,23 : 0,1 + 20,23 + 85 x 20,23
= 20,23 x 4 + 20,23 x 10 + 20,23 x 1 + 85 x 20,23
= 20,23 x (4 + 10 + 1 + 85)
= 20,23 x 100
= 2023
20,23 : 0,25 + 20,23 : 0,1 + 20,23 + 85 x 20,23
= 20,23 x 4 + 20,23 x 10 + 20,23 + 85 x 20,23
= 20,23 x ( 4 + 10 + 1 + 85 )
= 20,23 x 100
= 2023
20,23 \(\times\) 37 - 2,3 \(\times\) 5,5 + 20,23 \(\times\) 63 - 2,3 \(\times\) 4,5
= ( 20,23 \(\times\) 37 + 20,23 \(\times\) 63 ) - ( 2,3 \(\times\) 5,5 + 2,3 \(\times\) 4,5)
= 20,23 \(\times\) ( 37 + 63) - 2,3 \(\times\) ( 5,5 + 4,5)
= 20,23 \(\times\) 100 - 2,3 \(\times\) 10
= 2023 - 23
= 2000
Lời giải:
$2,5\times 20,23\times 8\times 5=2,5\times 20,23\times 4\times 2\times 5$
$=(2,5\times 4)\times 20,23\times (2\times 5)$
$=10\times 20,23\times 10=20,23\times 100=2023$
\(\text{25 x 20,23 + 105 x 20,23 - 20,25 x 20,23 - 9,75 x 20,23}\\ =20,23\text{ x }\left(25+105-9,75-20,25\right)\\ =20.23\text{ x }100=2023\)
a: =20,23(15,75+85,25-1)
=20,23*100
=2023
b: =4+4=8
c: =6,48(111-1-10)=648
d: =1,25*8*0,25*4
=10
a. 20,23 x 15,75 + 20,23 x 85,25 - 20,23
= 20,23 . (15,75 + 85,25 - 1)
= 20,23 . 100
= 2023
b.0,66 + 1,2+ 3,34+2,8
= 4+4
= 8
c.111 x 6,48 -6,48 - 6,48 x 10
= 6,48 . (111 - 1 -10)
= 648
d.1,25 x 0,25 x 8 x 4
= 1,25 . 8 . 0,25 . 4
= 10
20,23*20,24-20,22*8,25-20,22*5,9-2,022*60,9
=20,23*20,24-20,22(8,25+5,9+6,09)
=20,23*20,24-20,22*20,24
=20,24*(-0,01)
=-0,2024
y - 20,23 - y \(\times\) 20,22 + y = 2043,23
(y \(\times\)1 - y \(\times\) 20,22 + y \(\times\) 1) - 20,23 = 2043,23
y \(\times\)( 1 - 20,22 + 1) = 2043,23 + 20,23
- 18,22 y = 2063,46
y = 2063,46 : ( -18,22)
y = - 113,2524698
a: \(20,23\cdot7,5+20,23+20,23+20,23:2\)
\(=20,23\cdot7,5+20,23\cdot2+20,23\cdot0,5\)
\(=20,23\left(7,5+2+0,5\right)\)
\(=20,23\cdot10=202,3\)
b: \(100:9-79,3:9\)
\(=\left(100-79,3\right):9\)
\(=20,7:9=2,3\)
Cảm ơn