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a) 48 . 19 + 48 . 115 + 134 . 52
= 48 . (19 + 115) + 134 . 52
= 48 . 134 + 134 . 52
= 134 . (48 + 52)
= 134 . 100
= 13400
b) 43 . 37 + 43 . 73 + 57 . 66 + 57 . 44
= 43 . (37 + 73) + 57 . (66 + 44)
= 43 . 110 + 57 . 110
= 110 . (43 + 57)
= 110 . 100
= 11000
k cho mình đã rồi mình giải tiếp nha!
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(1+3+5+7+...+2002).(135135.137-135.137137)
= (1+3+5+7+...+2002). (135.1001.137-135.137.1001)
= (1+3+5+7+....+2002).0
= 0
Vậy kết quả bằng 0 nhé
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= [ 1 + 3 + 5 + ......+ 2002 ] . [ 135 . 1001 . 137 - 105 . 1001 . 137 ]
= [ 1 + 3 + 5 + ..... + 2002 ] . 0
= 0
(1 + 3 + 5 + 7 + ... + 2002) . (135135 . 137 - 135 . 137137)
= (1 + 3 + 5 + 7 + ... + 2002) . (135 . 1001 . 137 - 135 . 137 . 1001)
= (1 + 3 + 5 + 7 + ... + 2002) . 0
= 0
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(1 + 3 + 5 + 7 + ... + 2002) . (135135 . 137 - 135 . 137137)
= (1 + 3 + 5 + 7 + ... + 2002) . (135 . 1001 . 137 - 135 . 137 . 1001)
= (1 + 3 + 5 + 7 + ... + 2002) . 0
= 0
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a) \(10+11+12+...+99=\dfrac{\left(99+10\right)\left(\dfrac{99-10}{1}+1\right)}{2}=4905\)
b) \(1+6+11+...+51=\dfrac{\left(51+1\right)\left(\dfrac{51-1}{5}+1\right)}{2}=286\)
c) \(\left(1+3+5+...+2017\right)\left(135135.137-135.137137\right)=\left(1+3+5+...+2017\right)\left[1001\left(135,137-135.137\right)\right]=\left(1+3+5+...+2017\right).0=0\)
a)
=10+(11+99)+(12+98)+.....+(54+56)+55
=10+55+110+110+...+110
=10+55+110.(99-11):2
=10+55+110.44
=65+4840=4905
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(1+3+5+7+....+2002).(135135.137-137137.135)
=(1+3+5+7+...+2002).0
=0
(1+3+5+7+9+...+2002).(135135.137-137137.135)
=(1+3+5+7+...+2002).0
=0
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\(=\left(1+3+...+2021\right)\cdot\left[1001\cdot135\cdot137-1001\cdot135\cdot137\right]\)
\(=\left(1+3+...+2021\right)\cdot0\)
=0
= (1 + 3 + ... + 2021) x (135 x 1001 x 137 - 135 x 137 x 1001)
= (1 + 3 + ... + 2021) x 0
= 0
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a: =274+184=458
b: =29+132+868+237+163
=1000+400+29
=1429
f: =A*135*137(1001-1001)=0
e: =24*25+24*37+24*38
=24*100=2400
c: =31(98+2)=31*100=3100