tinh nhanh
a)73^2 - 27^2
b)37^2 - 13^2
c)20022 - 2^2
Tinh nhanh:
a)108^2-92^2
b)102^2+128.26-27^2
c)31^2-31.22+11^2
a, \(108^2-92^2=\left(108-92\right)\left(108+92\right)=16.200=3200\)
c, \(31^2-31.22+11^2=31^2-2.31.11+11^2=\left(31-11\right)^2=20^2=400\)
a: \(108^2-92^2=3200\)
b: \(102^2+128\cdot26-27^2=9675+3328=13003\)
c: \(31^2-31\cdot22+11^2=20^2=400\)
Tinh nhanh
a) 73^2-27^2
b) 37^-17^2
b) 2002^2-2^2
a: \(73^2-27^2=\left(73-27\right)\left(73+27\right)=100\cdot46=4600\)
b: \(37^2-17^2=\left(37-17\right)\left(37+17\right)=20\cdot54=1080\)
c: \(2002^2-2^2=\left(2002-2\right)\left(2002+2\right)=2004\cdot2000=4008000\)
a) 73^2 - 27^2 ... b) 37^2 - 13^2 ... c) 2002^2 - 2^2
tính hộ bn của mik với
a) 732 - 272
= ( 73 + 27 ) ( 73 - 27 )
= 100 . 46
= 4600
b) 372 - 132
= ( 37 + 13 ) ( 37 - 13 )
= 50 . 24
= 1200
c) 20022 - 22
= ( 2002 + 2 ) ( 2002 - 2 )
= 2004 . 2000
= 4008000
tính nhanh :
a, -52 . 13.(-2)2 . (-1) 2n+1 (n thuộc N)
b, -79.(73-27)-73.(-79+27)
a)
=25 . 13 . 4. (-1) = 100.(-13)=-1300
b)
= -79.73 + 79.27 + 73. 79 - 73. 27
=79. 27 - 73. 27
=27. 6=162
Cho a^2 +b ^2 +c ^2 =m .Tinh
A = ( 2a + 2b-c) ^ 2 + ( 2b+ 2c -a ) ^2 + (2c+2a-b) ^ 2
1. Phuc will look through a new English book tomorrow.
2. Which ethnic group has the largest population in Vietnam?
Tính nhanh:
a) 732 – 272; b) 372 - 132
c) 20022 – 22
a) 732 - 272
= (73 - 27)(73 + 27)
= 46 . 100
= 4600
b) 372 - 132
= (37 - 13)(37 + 13)
= 24 . 50
= 1200
c) 20022 - 22
= (2002 - 2)(2002 + 2)
= 2000 . 2004
= 4008000
a ) 732 - 272 = 432
b ) 372 - 132 = 242
c ) 20022 - 22 = 19982
a) \(73^2-27^2\)
b) \(37^2-13^2\)
c) \(2002^2-2^2\)
Bài giải:
a) 732 – 272 = (73 + 27)(73 – 27) = 100 . 46 = 4600
b) 372 - 132 = (37 + 13)(37 – 13) = 50 . 25 = 100 . 12 = 1200
c) 20022 – 22 = (2002 + 2)(2002 – 2) = 2004 . 2000 = 400800
732 - 272
tinh nhanh
73^2-27^2=(73-27)(73+27)=46.100=4600
tính nhanh
a, 69 mũ 2 - 31 mũ 2
b, 1023 mũ 2 - 23 mũ 2
c, 27 mũ 2 + 73 mũ 2 + 54.73
d, 63 mũ 2 + 13 mũ 2 - 26 . 63
e, 25 mũ 2 - 15 mũ 2
i, 87 mũ 2 + 73 mũ 2- 27 mũ 2 - 13 mũ 2
a)\(69^2-31^2=\left(69-31\right)\left(69+31\right)=38.100=3800\)
\(1023^2-23^2=\left(1023-23\right)\left(1023+23\right)=1000.1046=1046000\)
\(c,\left(27+73\right)^2-2.27.73+54.73\)
\(100^2-54.73+54.73=10000\)
\(d,\left(63-13\right)^2+2.13.63-26.63=50^2=2500\)