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\(A=165^2+70.165+35^2=165^2+2.35.165+35^2=\left(165+35\right)^2=200^2=40000\)
\(C=5^4.7^4-\left(35^2-1\right)\left(35^2+1\right)=35^4-[\left(35^2\right)^2-1^2]=35^4-35^4+1=1\)
A = 76.56-(353+2)(353-2)
= 356- 356-2
= -2
B = 19972-1996.1998
=19972-( 1997-1)(1997+1)
= 19972 - 1997-1
ĐẾN đey chịu ^^"
A: \(135^2+94\cdot153+47^2=135^2\cdot2\cdot47+153\cdot47\)
\(=47\left(36450+153\right)=36603\cdot47=1720341\)
B: \(126^2-152\cdot126+5776=126^2-2\cdot126\cdot76+76^2=\left(126-76\right)^2=50^2=2500\)
C: \(3^8\cdot5^8-\left(15^4-1\right)\left(15^4+1\right)=15^8-\left(15^8-1\right)=15^8-15^8+1=1\)
\(A=136^2-92.136+46^2=136^2-2.136.46+46^2=\left(136-46\right)^2=90^2=8100\)\(B=135^2+110.135+55^2=135^2+2.135.55+55^2=\left(135+55\right)^2=190^2=36100\)
a) \(37^2+2\cdot37\cdot13+13^2\)
\(=1369+962+169\)
\(=2500\)
b) \(35^2+24^2-48\cdot35\)
\(=125+576-1680\)
\(=121\)
c) sai quy luật
1)a)x+y=60
<=>(x+y)^2=3600
<=>x^2+2xy+y^2=3600(1)
mà xy=35 nên 2xy=2.35=70
(1)<=>x^2+70+y^2=3600
<=>x^2+y^2=3530
<=>(x^2+y^2)^2=12460900
<=>x^4+2x^2.y^2+y^4=12460900(2)
mà xy=35 nên 2x.x.y.y=2450
(2)<=>x^4+y^4=123458450
b)x+y=1
<=>(x+y)^3=1
<=>x^3+3x^2y+3xy^2+y^3=1
<=>x^3+y^3+3xy(x+y)=1
<=>x^3+y^3+3xy=1
=>M=1
x+y=1
<=>x^2+2xy+y^2=1(1)
B=x^3+y^3+3xy(x^2+y^2)+3xy(2xy)
=x^3+y^3+3xy(x^2+2xy+y^2)
=M.1=1(từ(1)
c)
x-y=1
<=>(x-y)^3=1
<=>x^3-3x^2y+3xy^2-y^3=1
<=>x^3-y^3-3xy(x-y)=1
<=>x^3-y^3-3xy=1
=>N=1
a/ \(5^4.3^4-\left(15^2-1\right)\left(15^2+1\right)\)
\(=15^4-\left(15^4-1^2\right)\)
\(=1\)
\(\left(18^4+1\right)\left(18-1\right)-9^8.2^8\) câu này bn xem lại đề đi nha, chắc bn chép sai đề rồi
b/ \(\frac{77^2+17^2-34.77}{77^2-17^2}\) \(=\frac{77^2-2.17.77+17^2}{\left(77-17\right)\left(77+17\right)}\)
= \(\frac{\left(77-17\right)^2}{\left(77-17\right)\left(77+17\right)}\)
= \(\frac{77-17}{77+17}\)
\(=\frac{60}{94}=\frac{30}{47}\)
\(\frac{135^2+130.135+65^2}{135^2-65^2}=\frac{135^2+2.65.135+65^2}{\left(135-65\right)\left(135+65\right)}\)
\(=\frac{\left(135+65\right)^2}{\left(135-65\right)\left(135+65\right)}\)
\(=\frac{135+65}{135-65}=\frac{200}{70}=\frac{20}{7}\)
chúc bn học tốt
Lời giải:
$135^2+35^2-70.13=(135-35)^2+2.135.35-70.13$
$=100^2+135.70-70.13$
$=100^2+70(135-13)=10000+70.122=10000+8540=18540$