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

2024-12-02 20:05:25
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回答1:

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