5M的2次方--{5M的2次方--(2M的2次方-MN)-7MN-5}
=(2M的2次方-MN)-7MN-5
=2(M的2次方+3MN)-5
=2X5-5
=5
已知M的2次方+3MN=5,求5M的2次方--{5M的2次方--(2M的2次方-MN)-7MN-5}的值
已知M的2次方+3MN=5,求5M的2次方--{5M的2次方--(2M的2次方-MN)-7MN-5}的值
其他人气:602 ℃时间:2019-11-04 13:16:41
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