已知A=5mn-2m²+3n²,B=-3/2mn+5m²+n²/2,求﹣1/2 A+B过程! 求解
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![已知A=5mn-2m²+3n²,B=-3/2mn+5m²+n²/2,求﹣1/2 A+B过程! 求解](/uploads/image/z/6279793-25-3.jpg?t=%E5%B7%B2%E7%9F%A5A%3D5mn%EF%BC%8D2m%26%23178%3B%EF%BC%8B3n%26%23178%3B%2CB%EF%BC%9D%EF%BC%8D3%2F2mn%EF%BC%8B5m%26%23178%3B%EF%BC%8Bn%26%23178%3B%2F2%2C%E6%B1%82%EF%B9%A31%2F2+A%EF%BC%8BB%E8%BF%87%E7%A8%8B%21+%E6%B1%82%E8%A7%A3)
已知A=5mn-2m²+3n²,B=-3/2mn+5m²+n²/2,求﹣1/2 A+B过程! 求解
已知A=5mn-2m²+3n²,B=-3/2mn+5m²+n²/2,求﹣1/2 A+B
过程! 求解
已知A=5mn-2m²+3n²,B=-3/2mn+5m²+n²/2,求﹣1/2 A+B过程! 求解
解
-1/2A+B
=-1/2(5mn-2m²+3n²)+(-3/2mn+5m²+n²/2)
=(-5/2mn-3/2mn)+(m²+5m²)+(-3/2n²+1/2n²)
=-4mn+6m²-n²