①a^2*b^2-c^2=(ab+c)(______) ②25x^4-1/4*y^2=(__+1/2y)(__-1/2y) (填空题)
问题描述:
①a^2*b^2-c^2=(ab+c)(______) ②25x^4-1/4*y^2=(__+1/2y)(__-1/2y) (填空题)
答
①a^2*b^2-c^2=(ab+c)(___ab-c___)
②25x^4-1/4*y^2=(_5x²_+1/2y)(_5x²_-1/2y)
答
a²×b²-c²
=(ab)²-c²
=(ab+c)(ab-c)
25x^4-1/4×y²
=(5x²)²-(y/2)²
=(5x²+y/2)(5x²-y/2)