m*n=(m+n)x(m-n)求30*(5*3)

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m*n=(m+n)x(m-n)求30*(5*3)
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m*n=(m+n)x(m-n)求30*(5*3)
m*n=(m+n)x(m-n)求30*(5*3)

m*n=(m+n)x(m-n)求30*(5*3)
30*(5*3)
=30*[(5+3)(5-3)]
=30*16
=(30+16)(30-16)
=644

450

(5*3)=(5+3)*(5-3)=16
30*(5*3)=(30+16)*(30-16)=46*14=644