M=5N³+70N²,求N

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M=5N³+70N²,求NM=5N³+70N²,求NM=5N³+70N²,求NN = (3 sqrt(3)&n

M=5N³+70N²,求N
M=5N³+70N²,求N

M=5N³+70N²,求N
N = (3 sqrt(3) sqrt(27 M^2-54880 M)+27 M-27440)^(1/3)/(3 10^(1/3))+(196 10^(1/3))/(3 (3 sqrt(3) sqrt(27 M^2-54880 M)+27 M-27440)^(1/3))-14/3
N = -((1-i sqrt(3)) (3 sqrt(3) sqrt(27 M^2-54880 M)+27 M-27440)^(1/3))/(6 10^(1/3))-(98 10^(1/3) (1+i sqrt(3)))/(3 (3 sqrt(3) sqrt(27 M^2-54880 M)+27 M-27440)^(1/3))-14/3
N = -((1+i sqrt(3)) (3 sqrt(3) sqrt(27 M^2-54880 M)+27 M-27440)^(1/3))/(6 10^(1/3))-(98 10^(1/3) (1-i sqrt(3)))/(3 (3 sqrt(3) sqrt(27 M^2-54880 M)+27 M-27440)^(1/3))-14/3