已知-m+2n=5,那么6(m-2n)²-4m+8m-13的值是多少?打错了,是已知-m+2n=5,那么6(m-2n)²-4m+8n-13的值是多少?
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![已知-m+2n=5,那么6(m-2n)²-4m+8m-13的值是多少?打错了,是已知-m+2n=5,那么6(m-2n)²-4m+8n-13的值是多少?](/uploads/image/z/5303240-8-0.jpg?t=%E5%B7%B2%E7%9F%A5-m%2B2n%3D5%2C%E9%82%A3%E4%B9%886%EF%BC%88m-2n%EF%BC%89%26%23178%3B-4m%2B8m-13%E7%9A%84%E5%80%BC%E6%98%AF%E5%A4%9A%E5%B0%91%3F%E6%89%93%E9%94%99%E4%BA%86%EF%BC%8C%E6%98%AF%E5%B7%B2%E7%9F%A5-m%2B2n%3D5%EF%BC%8C%E9%82%A3%E4%B9%886%EF%BC%88m-2n%EF%BC%89%26%23178%3B-4m%2B8n-13%E7%9A%84%E5%80%BC%E6%98%AF%E5%A4%9A%E5%B0%91%EF%BC%9F)
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已知-m+2n=5,那么6(m-2n)²-4m+8m-13的值是多少?打错了,是已知-m+2n=5,那么6(m-2n)²-4m+8n-13的值是多少?
已知-m+2n=5,那么6(m-2n)²-4m+8m-13的值是多少?
打错了,是已知-m+2n=5,那么6(m-2n)²-4m+8n-13的值是多少?
已知-m+2n=5,那么6(m-2n)²-4m+8m-13的值是多少?打错了,是已知-m+2n=5,那么6(m-2n)²-4m+8n-13的值是多少?
那个+8m是+8n吧?
-m+2n=5
m-2n=-5
6(m-2n)²-4m+8m-13
=6×(-5)²-4m+8n-13
=150-4m-2n)-13
=150-4×(-5)-13
=150+20-13
=157
6(m-2n)²-4m+8m-13
=6(-m+2n)²+4(-m+2n)-13
=6×5²+4×5-13
=150+20-13
=157
157
式中后面的8m应该是8n吧,如果是答案则为157
=6*(-5)^2+4*5-13=150+20-13=157,8m是不是8n啊。
m-2n= -5 6(m-2n)^2-4m+8n-13=6(m-2n)^2-4(m-2n)-13=6*(-5)^2-4*(-5)-13=157
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