计算:(1)(3x-5)²;(2)(-4a+1/2b)².
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![计算:(1)(3x-5)²;(2)(-4a+1/2b)².](/uploads/image/z/1239776-8-6.jpg?t=%E8%AE%A1%E7%AE%97%3A%281%29%283x-5%29%26%23178%3B%3B%282%29%28-4a%2B1%2F2b%29%26%23178%3B.)
计算:(1)(3x-5)²;(2)(-4a+1/2b)².
计算:(1)(3x-5)²;(2)(-4a+1/2b)².
计算:(1)(3x-5)²;(2)(-4a+1/2b)².
(1)
(3x-5)²
=(3x)²-2*(3x)*5+5²
=9x²-30x+25
(2)
(-4a+1/2b)².
=(1/2b-4a)²
=b²/4 -4ab+16a²
计算:(1)(3x-5)²;
=9x²-30x+25
(2)(-4a+1/2b)²
=16a²-4ab+1/4b²
.