初二数学整式的乘法与因式分解(要详细过程0计算:(1)(-2x2y3)²·(xy)³;(2)(2a+3b)(2a-b);(3)5x²(x+1)(x-1).(4)(2x+y-1)²(5)59.8×60.2(6)198²
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初二数学整式的乘法与因式分解(要详细过程0计算:(1)(-2x2y3)²·(xy)³;(2)(2a+3b)(2a-b);(3)5x²(x+1)(x-1).(4)(2x+y-1)²(5)59.8×60.2(6)198²
初二数学整式的乘法与因式分解(要详细过程0
计算:(1)(-2x2y3)²·(xy)³;(2)(2a+3b)(2a-b);(3)5x²(x+1)(x-1).
(4)(2x+y-1)²
(5)59.8×60.2
(6)198²
初二数学整式的乘法与因式分解(要详细过程0计算:(1)(-2x2y3)²·(xy)³;(2)(2a+3b)(2a-b);(3)5x²(x+1)(x-1).(4)(2x+y-1)²(5)59.8×60.2(6)198²
(1)(-2x2y3)²·(xy)³
=4x^4y^6·x³y³
=4x^7y^9
(2)(2a+3b)(2a-b)
=4a²-2ab+6ab-3b²
=4a²+4ab-3b²
(3)5x²(x+1)(x-1)
=5x²(x²-1)
=5x^4-5x²
(4)(2x+y-1)²
=4x²+y²+1+4xy-2y-4x
(5)59.8×60.2
=(60-0.2)(60+0.2)
=3600-0.04
=3599.96
(6)198²
=(200-2)²
=200²-4×200+4
=40000-800+4
=39204
5. (60-0.2)× (60+0.2)=60²-0.2²
6. (200-2)²=200²-2×2×200+1