có lộn đề ko bn ơi 

c). 1081.46

d). 1000

e. P=(x−y)(x2+xy+y2)−2y3=x3−y3−2y3=x3−3y3=(12)3−3.(23)3=−5572

mik k biết nữa

\(77^2+23^2+77\cdot46\)

\(=77^2+2\cdot77\cdot23+23^2\)

\(=\left(77+23\right)^2\)

\(=100^2\)

\(=10000\)

\(\text{77^2+23^2+77.46}=77^2+2.77.23+23^2=\left(77+23\right)^2=100^2=10000\)

mơn bạn :33

a) 23²+77²+46.77

=23²+ 2.23.77+77²

=(23+77)²= 100²=10000

b) 31²+169²+62.169

=31²+2.1.169+169²

=(31+169)²=200²=40000

c) 103²-9

=103²-3²

= (103-3)(103+3)

= 100.106=10600

d) 45²-15²

=(45-15)(45+15)= 30.60=1800

10000

=77(77+46)+23²

=77.123+529

=10 000

\(a.101^2-99^2=\left(101+99\right)\left(101-99\right)=200.2=400\)

\(b.98.102=98.\left(100+2\right)=9800+196=9996\)

\(c,77^2+23^2+77.46=77^2+23^2+2.77.23=\left(77+23\right)^2=100^2=10000\)

1. a) 101² - 99² = (101 + 99)(101 - 99) = 200 . 2 = 400

b) 98.102 = (100 - 2)(100 + 2) = 100² - 4 = 10000 - 4 = 9996

c) 77² + 23² + 77.46 = 77² + 23² + 77.23.2 = (23 + 77)² = 100² = 10000

d) M = x³ + 9x² + 27x + 27 = (x + 3)³ = (7 + 3)³ = 10³ = 1000

2. a) 2x² + 3x - 5 = 0

=> 2x² + 5x - 2x - 5 = 0

=> x(2x + 5) - (2x + 5) = 0

=> (x - 1)(2x + 5) = 0

=> \(\backslash\text{orbr} \left{\right. x - 1 = 0 \\ 2 x + 5 = 0\)

=> \(\backslash\text{orbr} \left{\right. x = 1 \\ x = - \frac{5}{2}\)

b) 2x² - 11x - 51 = 0

=> 2x² - 17x + 6x - 51 = 0

=> x(2x - 17) + 3(2x - 17) = 0

=> (x + 3)(2x - 17) = 0

=> \(\backslash\text{orbr} \left{\right. x + 3 = 0 \\ 2 x - 17 = 0\)

=> \(\backslash\text{orbr} \left{\right. x = - 3 \\ x = \frac{17}{2}\)

\(77^2+23+77.46\)

\(=77.77+23+77.46\)

\(=77.\left(77+46\right)+23\)

\(=77.123+23\)

\(=9471+23=9494\)

\(77^2+23+77.46\)

\(=77.77+23+77.46\)

\(=77.\left(77+46\right)+23\)

\(=77.123+23\)

\(=9471+23\)

\(=9494\)