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First question: The second power of (M + n) - the second power of 4N= Second question: The fourth power of X - the second power of 2x, the second power of Y + the fourth power of Y= Third question: The second power of 39.8-2 × 39.8 × 49.8 + 49.8= Fourth question: If the quadratic power of M - the quadratic power of n = 8, - M-N = - 4, then the value of M-N is
Question 1: (M + n) & #178; - (4N) & #178; = (M + N + 4N) (M + n-4n) = (M + 5N) (m-3n)
Question 2: x ^ 4 - (2x) &# 178; Y & # 178; + y ^ 4 = (X & # 178;) &# 178; - 4x & # 178; Y & # 178; + (Y & # 178;) &# 178;
=（x²）²-2x²y²+（y²）²-2x²y²
=（x²-y²）²-2x²y²
The third question: 39.8-178; - 2 * 39.8-49.8 + 49.8-178; = (39.8-49.8) & 178; = (- 10) & 178; = 100
Question 4: - M-N = - (M + n) = - 4, M + n = - 4
m²-n²=（m+n)(m-n)=8
m-n=8÷（-4）=-2
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