Question

Anjie

求解

- (3x一1)7十10(3x一1)十25三?
(A) (3x一4)-     (B) (3x十4)-     (C) (3x十5)-     (D) (3x一5)/
2一8三?

(B)2G+2yG一2
(D) 6G一29G一2)

(A) 4G十2)G一2
(C) 8十2y)G一2

(BO)G一2)
(D) (7)y)G+D)G一)

(B) (3x十10)
(D) (一3x一10)

Answer 1

✨ 最佳解答 ✨

宿願-jim

(3x-1)²+10(3x-1)+25
=[(3x-1)+5]²
=(3x+4)²

2x²-8y²
=2(x²-4y²)
=2(x+2y)(x-2y)

x⁴-y⁴
=(x²)²-(y²)²
=(x²+y²)(x²-y²)
=(x²+y²)(x+y)(x-y)

81-18(3x-1)+(1-3x)²
=(-3x+1)²-18(3x-1)+81
=-(3x-1)²-18(3x-1)+81
=-[(3x-1)-9]²
=-(3x-10)²
=(-3x+10)²

乘法公式