Question

a/1+b/2+c/3=d/4 用a c d 来表示b

Answer 1

1/a+2/b+3/c=4/d

2/b=4/d-1/a-3/c

=(4ac-cd-3ad)/acd

b/2=acd/(4ac-cd-3ad)

b=2acd/(4ac-cd-3ad)

x^3-36

这个不能分解

如果是x^2-36

则=(x+6)(x-6)

2c^2+mc-10pc-5pm

=c(2c+m)-p(2c+m)

=(2c+m)(c-p)