m²-14m+49 b²-22b=121 y²+y+¼ 25m²-80m+64 4a²+3a+81

m²-14m+49 b²-22b=121 y²+y+¼ 25m²-80m+64 4a²+3a+81
m²-14m+49 b²-22b=121 y²+y+¼ 25m²-80m+64 4a²+3a+81

m²-14m+49 b²-22b=121 y²+y+¼ 25m²-80m+64 4a²+3a+81
m²-14m+49
=m²-14m+7²
=(m-7)²
b²-22b+121
=b²-22b+11 ²
=(b-11)²
y²+y+¼
=y²+y+(½)²
=(y+½)²
25m²-80m+64
=(5m)²-80m+8²
=(5m-8)²
4a²+36a+81 （中间应为36a）
=(2a)²+36a+9²
=(2a+9)²
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