25 - ( 62 -75 ) + (- 38)
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a) \(\left(-25\right).5.\left(-4\right).2\)
\(=\left[\left(-25\right).\left(-4\right)\right].\left(2.5\right)\)
\(=100.10=1000\)
b) \(\left(-456\right)-\left(67-456\right)\)
\(=-456-67+456\)
\(=\left(456-456\right)-67\)
\(=67\)
\(25-\left(62+25\right)+\left(75-62\right)-\left(-25\right)\)
\(=25-62-25+75-62+25\)
\(=\left(25-25\right)+\left(-62-62\right)+\left(75+25\right)\)
\(=0+\left(-124\right)+100=224\)
a/ 48 + 25 – 38 = 73 – 38 = 35
b/ 100 - 38 + 15 = 62 + 15 = 77
(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
\(\left(5346-2808\right):54+51\)
\(=2538:54+51\)
\(=47+51=98\)
\(187\left(38+62\right)-87\left(62+38\right)\)
\(=187.100-87.100\)
\(=100\left(187-87\right)\)
\(=100.100=10000\)
\(25\left\{32:\left[12-4+4\left(16:8\right)\right]\right\}\)
\(=25\left\{32:\left[12-4+4.2\right]\right\}\)
\(=25\left\{32:\left[12-4+8\right]\right\}\)
\(=25\left\{32:16\right\}\)
\(=25.2=50\)
\(A=50+51+52+......+100\)
\(=\dfrac{\left[\left(100-50\right):1+1\right]\left(100+50\right)}{2}\)
\(=3825\)
a: Sửa đề: \(16\left(38-2\right)-38\left(16-2\right)\)
\(=16\cdot38-16\cdot2-38\cdot16+38\cdot2=22\cdot2=44\)
b: \(=-25\cdot75+25\cdot45-75\cdot45+75\cdot25\)
\(=25\cdot45-75\cdot45\)
\(=45\cdot\left(-50\right)=-2250\)
=25-62+75-38
=100-100
=0
= 0