m平方减9等于0怎么解
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m² - 9 = 0
解:
解法一(开平方):
m² = 9
m = ±3
解法二(一元二次方程求根公式):
m² - 9 = 0
a=1,b=0,c=-9
Δ = b²-4ac = 0²- 4*1*(-9)=36
m = (-b ±√Δ)/2a = (-0±√36)/(2*1)= ±6/2 = ±3
解:
解法一(开平方):
m² = 9
m = ±3
解法二(一元二次方程求根公式):
m² - 9 = 0
a=1,b=0,c=-9
Δ = b²-4ac = 0²- 4*1*(-9)=36
m = (-b ±√Δ)/2a = (-0±√36)/(2*1)= ±6/2 = ±3
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