43+11=
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\(27+\left(43+11\right)-43-\left(27+11\right)\)
\(=27+43+11-43-27-11\)
\(=\left(27-27\right)+\left(43-43\right)+\left(11-11\right)\)
\(=0+0+0\)
\(=0\)
27+(43+11)-43-(27+11)
= 27 + 43 + 11 - 43 - 27 -11
= ( 27 - 27 ) + ( 43 - 43 ) + ( 11-11 )
= 0 + 0 + 0
=0
a. $\dfrac{14}{15}+\dfrac{2}{11}+\dfrac{1}{15}+\dfrac{4}{11}+\dfrac{10}{22}$
$=(\dfrac{14}{15}+dfrac{1}{15})+(\dfrac{2}{11}+\dfrac{4}{11}+\dfrac{10}{22})$
$=1+1=2$
b. $74\times43-43+27\times43$
$=(74-1+27)\times43$
$=100\times43=4300$
\(a)\dfrac{14}{15}+\dfrac{2}{11}+\dfrac{1}{15}+\dfrac{4}{11}+\dfrac{10}{22}\)
\(=\left(\dfrac{14}{15}+\dfrac{1}{15}\right)+\dfrac{2}{11}+\dfrac{4}{11}+\dfrac{5}{11}\)
\(=1+1=2\)
\(b)74\times43-43+27\times43\)
\(=43\times\left(74-1+27\right)\)
\(=43\times100=4300\)
\(\frac{5+8+11+14+...+68+71}{2\times43+3\times43+43\times5+7}\).
Xét tử số: 5+ 8+ 11+ 14+...+ 68.
Có số các số hạng là:
( 68- 5): 3+ 1= 22
Tử số là:
( 68+ 5)x 22: 2= 803
Xét mẫu số: 2x 43+ 3x 43+ 43x 5+ 7=( 2+ 3+ 5)x 43+ 7= 10x 43+ 7= 430+ 7= 437.
=> \(\frac{5+8+11+14+...+68+71}{2\times43+3\times43+43\times5+7}\)= \(\frac{803}{437}\).
[ 43 * 11 + 44 * 11 + 45 * 11 +46 *11 + 47 * 11 ] : [ 45 * 55 ]
= [ 11 x (43 + 44 + 45 + 46 + 47) ] : 2475
= 11 x 225 : 2475
= 2475 : 2475
= 1
1 đúng nhé! 100% là đúng
D = 3\(\dfrac{1}{2}\) \(\times\) \(\dfrac{12}{43}\) + \(\dfrac{49}{14}\) \(\times\) \(\dfrac{31}{43}\) + \(\dfrac{11}{2}\)
D = \(\dfrac{7}{2}\) \(\times\) \(\dfrac{12}{43}\) + \(\dfrac{7}{2}\) \(\times\) \(\dfrac{31}{43}\) + \(\dfrac{11}{2}\)
D = \(\dfrac{7}{2\times43}\) \(\times\) (12 + 31) + \(\dfrac{11}{2}\)
D = \(\dfrac{7}{2\times43}\) \(\times\) 43 + \(\dfrac{11}{2}\)
D = \(\dfrac{7}{2}\) + \(\dfrac{11}{2}\)
D = 9
D = 3 và 1/2 x 12/43 + 49/14 x 31/43 + 11/2
= 7/2 x 12/43 + 49/14 x 31/43 + 11/2
= 42/43 + 217/36 + 11/2
=9
# https://lazi.vn/user/tnsociu
43^2004+43^2005=43^2004+43^2004.43
=43^2004.(1+43)
=43^2004.44
Ta có 43^2004 + 43^2005 = 43^2004 + 43^2004 x 43
=43^2004 x (43 + 1) =43^2004 x 44
=43^2004 x 11 x 4 chia hết cho 11
\(-8x-\left(-11\right)=43\)
\(\Leftrightarrow-8x=43-11\)
\(\Leftrightarrow-8x=32\)
\(\Leftrightarrow x=\dfrac{32}{-8}\)
\(\Leftrightarrow x=-4\)
43 + 11 = 54
43+11=54