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52.143 -52.39 -8.26 =52.143-52.39-4.52 =52.(143-39-4) =52. 100 =5200 chúc bạn thành công !
52 . 143 - 52 . 39 - 8 . 26
= 52 . 143 - 52 . 39 - 4 . 52
= 52 . (143 - 39 - 4)
= 52 . 100 = 5200
a: \(2004^2-16=2000\cdot2008=4016000\)
b: \(892^2+892\cdot216+108^2=1000^2=1000000\)
c: \(36^2-52\cdot36+26^2=10^2=100\)
a) \(2004^2-16=2004^2-4^2=\left(2004-4\right)\left(2004+4\right)=2000.2008=4016000\)
b) \(892^2+892.216+108^2\)\(=892^2+2.892.108+108^2\)
\(=\left(892+108\right)^2\)
\(=1000^2=1000000\)
c) \(10,2.9,8-9,8.0,2+10,2^2-10,2.0,2\)\(=9,8\left(10,2-0,2\right)+10,2\left(10,2-0,2\right)\)
\(=9,8.10+10,2.10\)
\(=98+102=200\)
d) \(36^2+26^2-52.36=36^2-2.36.26+26^2\)
\(=\left(36-26\right)^2=10^2=100\)
g) \(20,03.45+20,03.47+20,03.8\)\(=20,03.\left(45+47+8\right)\)
\(=20,03.100=2003\)
h)\(15,75.175-15,75.55-15,75.20\)\(=15,75.\left(175-55-20\right)\)
\(=15,75.100=1575\)
a, \(36^2+26^2-52.36=36^2-2.26.36+26^2=\left(36-26\right)^2=10^2=100\)
\(b,2004^2-16^2=\left(2004-16\right)\left(2004+16\right)=1988.2020=4015760\)
\(a,36^2+26^2-52.36\)
\(=36^2-2.26.36+26^2\)
\(=\left(36-26\right)^2\)
\(=10^2=100\)
\(b,2004^2-16^2\)
\(=\left(2004-16\right)\left(2004+16\right)\)
\(=1988.2020\)
\(=4015760\)
\(48^2-42^2+64-52^2\)
\(=\left(48^2-52^2\right)-\left(42^2-64\right)\)
\(=\left(48^2-52^2\right)-\left(42^2-8^2\right)\)
\(=\left(48-52\right)\left(48+52\right)-\left(42+8\right)\left(42-8\right)\)
\(=-4\cdot100-50\cdot34\)
\(=-8\cdot50-50\cdot34\)
\(=-50\cdot\left(8+34\right)\)
\(=-50\cdot42\)
\(=-2100\)
52 . 143 - 26 . 78 - 2 . 104
= 52 . 143 - 52 . 39 - 52 . 4
= 52 ( 143 - 39 - 4 )
= 52 . 100
= 5200