1.858²-558²2.202²+202×196+98²3.x²-2xy+y²-94.(x-4)(x+1)+3x
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![1.858²-558²2.202²+202×196+98²3.x²-2xy+y²-94.(x-4)(x+1)+3x](/uploads/image/z/2689735-31-5.jpg?t=1.858%26%23178%3B-558%26%23178%3B2.202%26%23178%3B%2B202%C3%97196%2B98%26%23178%3B3.x%26%23178%3B-2xy%2By%26%23178%3B-94.%28x-4%29%28x%2B1%29%2B3x)
1.858²-558²2.202²+202×196+98²3.x²-2xy+y²-94.(x-4)(x+1)+3x
1.858²-558²
2.202²+202×196+98²
3.x²-2xy+y²-9
4.(x-4)(x+1)+3x
1.858²-558²2.202²+202×196+98²3.x²-2xy+y²-94.(x-4)(x+1)+3x
1.858²-558²=(858+558)(858-558)=1416*300=424800
2.202²+202×196+98²=(202+98)²=90000
3.x²-2xy+y²-9=(x-y)²-9=(x-y+3)(x-y-3)
4.(x-4)(x+1)+3x=x²-3x-4+3x=x²-4=(x+2)(x-2)
1=(858-558)*(858+558)
2=(202+98)^2
3=(x-y)^2-9=(x-y-3)*(x-y+3)
4=x^2-3x-4+3x=(x-2)(x+2)
1. 858²-558²=(858-558)*(858+558)=300*1416=424800
2. 202²+202×196+98²=202²+2×202×98+98²=(202+98)²=300²=90000
3. x²-2xy+y²-9=(x-y)²-9=(x-y+3)(x-y-3)
4. (x-4)(x+1)+3x=x²-3x-4+3x=x²-4=(x+2)(x-2)
858²-558²
=(858-558)(858+558)
=300×1416
=424800
202²+202×196+98²
=(202+98)²
=300²
=90000
x²-2xy+y²-9
=(x-y)²-9
=(x-y-3)(x-y+3)
(x-4)(x+1)+3x
=x²-3x-4+3x
=x²-4
=(x-2)(x+2)