- 12 + 38 +62 =
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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
\(\left(5346-2808\right):54+51\)
\(=2538:54+51\)
\(=47+51=98\)
\(187\left(38+62\right)-87\left(62+38\right)\)
\(=187.100-87.100\)
\(=100\left(187-87\right)\)
\(=100.100=10000\)
\(25\left\{32:\left[12-4+4\left(16:8\right)\right]\right\}\)
\(=25\left\{32:\left[12-4+4.2\right]\right\}\)
\(=25\left\{32:\left[12-4+8\right]\right\}\)
\(=25\left\{32:16\right\}\)
\(=25.2=50\)
\(A=50+51+52+......+100\)
\(=\dfrac{\left[\left(100-50\right):1+1\right]\left(100+50\right)}{2}\)
\(=3825\)
a) 113.38+87.62+113.62+87.38
=(113.38+87.38)+(87.62+113.62)
=38.(113+87)+62.(87+113)
=38.200+62.200
=200.(38+62)
=200.100
=20000
b) 2.125.18+3.12.252+4.223.9
= 2.18.125+3.12.252+4.9.223
=36.125+36.252+36.223
=36.(125+252+223)
=36.500
=18000
Chúc bạn học tốt~~~
+) 187 x ( 38 + 62 ) - 87 x ( 62 + 38 )
= ( 62 + 38 ) x ( 187 - 87 )
= 100 x 100
= 10000
p/s : làm từng phần đợi mk chút ^^
25 x { 32 : [ 12 - 4 + 4 x ( 16 : 8 ) ] }
= 25 x { 32 : [ 8 + 4 x 2 ] }
= 25 x { 32 : 16 }
= 25 x 2
= 50
\(12.62.3+6^2.38-125:25\\ =36.62+36.38-5\\ =36.\left(62+38\right)-5\\ =36.100-5\\ =3600-5\\ =3595.\)
\(12\cdot62\cdot3+6^2\cdot38-125:25\)
\(=12\cdot62\cdot3+36\cdot38-5\)
\(=2232+1368-5\)
\(=3595\)
Lời giải:
$A=64^2-54^2=(64-54)(64+54)=10.118=1180$
$B=76^2+2.76.23+23^2=(76+23)^2=99^2=(100-1)^2=100^2-2.100+1$
$=10000-200+1=9801$
$C=88^2+62^2-38^2-12^2=(88^2-38^2)+(62^2-12^2)$
$=(88-38)(88+38)+(62-12)(62+12)$
$=50.126+50.74=50(126+74)=50.200=10000$
62x62+62+38
=62x62+62x1+8
=62x(62+1)+8
=62x68+8
=3906+8
=3914
- 12 + 38 + 62
= -12 + (38+62)
= 100 - 12
= 88