100-45+54-12+99=?
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\(\dfrac{36}{54}\) = \(\dfrac{36:18}{54:18}\) = \(\dfrac{2}{3}\)
\(\dfrac{28}{49}\) = \(\dfrac{28:7}{49:7}\) = \(\dfrac{4}{7}\)
\(\dfrac{48}{100}\) = \(\dfrac{48:4}{100:4}\) \(\dfrac{12}{25}\)
\(\dfrac{45}{81}\) = \(\dfrac{45:9}{81:9}\) = \(\dfrac{5}{9}\)
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(5346-2808) : 54 + 51
=2538 : 54 + 51
= 47 + 51 = 98
187 . ( 38 + 62 ) - 87 . (62 + 38 )
=187 . 100 - 87 . 100
= 100 . ( 187 - 87 )
= 100 . 100
= 10000
25. { 32 : [12 -4 + 4 . ( 16 : 8 )]}
= 25. { 32 : [12 - 4 + 8]}
= 25 . { 32 : [8 + 8 ]}
= 25 . { 32 : 16 }
= 25 . 2 =50
A = 50 +51 + 52 + ......+ 99+100
A = ( 100 + 50 ) . 51 : 2
A = 150 .51 : 2
A = 7650 : 2
A = 3825
Chuc ban hoc tot
\(\left(5346-2808\right):54+51\)
\(=2538:54+51\)
\(=47+51=98\)
\(187\left(38+62\right)-87\left(62+38\right)\)
\(=187.100-87.100\)
\(=100\left(187-87\right)\)
\(=100.100=10000\)
\(25\left\{32:\left[12-4+4\left(16:8\right)\right]\right\}\)
\(=25\left\{32:\left[12-4+4.2\right]\right\}\)
\(=25\left\{32:\left[12-4+8\right]\right\}\)
\(=25\left\{32:16\right\}\)
\(=25.2=50\)
\(A=50+51+52+......+100\)
\(=\dfrac{\left[\left(100-50\right):1+1\right]\left(100+50\right)}{2}\)
\(=3825\)
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b, [(-851)+5924]+[851+(-5924)]
= [-851 + 5924] + [851 - 5924]
= -851 + 5924 + 851 - 5924
= (851 - 851) + (5924 - 5924)
= 0 + 0
= 0
c,46.(-17) - 46.63 + 54.(-42) + 54.(-38)
= 46.(-17 - 63) + 54.[(-42).(-38)]
= 46.(-80) + 54.(-80)
= -80.(46 + 54)
= -80.100
= -8000
d,1+4+7+10+...+99-100
= (97 + 1).33 : 2 + 99 - 100
= 98.33 : 2 + 99 - 100
= 1617 + 99 - 100
= 1616
e,1-2+3-4+5-6+...+99-100
= (1-2) + (3-4) + (5-6) + ...+ (99-100)
= -1 + (-1) + (-1) + .... + (-1) có 50 số -1
= -1.50
= -50
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