a>b,且a,b均为自然数,定义新运算O为:aOb=a+(a-1)+(a-2)+-----+(a-b+1)+(a-b)(1) 求 8O6(2) 若 mO5=27,求m的值
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![a>b,且a,b均为自然数,定义新运算O为:aOb=a+(a-1)+(a-2)+-----+(a-b+1)+(a-b)(1) 求 8O6(2) 若 mO5=27,求m的值](/uploads/image/z/2450457-9-7.jpg?t=a%3Eb%2C%E4%B8%94a%2Cb%E5%9D%87%E4%B8%BA%E8%87%AA%E7%84%B6%E6%95%B0%2C%E5%AE%9A%E4%B9%89%E6%96%B0%E8%BF%90%E7%AE%97O%E4%B8%BA%EF%BC%9AaOb%3Da%2B%28a-1%29%2B%28a-2%29%2B-----%2B%EF%BC%88a-b%2B1%EF%BC%89%2B%EF%BC%88a-b%29%281%29+%E6%B1%82+8O6%282%29+%E8%8B%A5+mO5%3D27%2C%E6%B1%82m%E7%9A%84%E5%80%BC)
a>b,且a,b均为自然数,定义新运算O为:aOb=a+(a-1)+(a-2)+-----+(a-b+1)+(a-b)(1) 求 8O6(2) 若 mO5=27,求m的值
a>b,且a,b均为自然数,定义新运算O为:
aOb=a+(a-1)+(a-2)+-----+(a-b+1)+(a-b)
(1) 求 8O6
(2) 若 mO5=27,求m的值
a>b,且a,b均为自然数,定义新运算O为:aOb=a+(a-1)+(a-2)+-----+(a-b+1)+(a-b)(1) 求 8O6(2) 若 mO5=27,求m的值
aOb=a+(a-1)+(a-2)+-----+(a-b+1)+(a-b)
(1),8O6=8+7+6+5+4+3+2=35
(2),mO5=27
m+(m-1)+(m-2)+(m-3)+(m-4)+(m-5)
=6m-15=27
m=7
(1)8O6=8+7+6+5+4+3+2=35
(2)mO5=m+(m-1)+(m-2)+(m-3)+(m-4)+(m-5)=27
所以m=7