Question

(a+b)^4=?

(a+b)^5=?
(a+b)^6=?
(a+b)^7=?

Answer 1

(a+b)^4=a^4+4*a^3*b+6*a^2*b^2+4*a*b^3+b^4

(a+b)^5=a^5+5*a^4*b+10*a^3*b^2+10*a^2*b^3+5*a*b^4+b^5

(a+b)^6=a^6+6*a^5*b+15*a^4*b^2+20*a^3*b^3+15*a^2*b^4+6*a*b^5+b^6

(a+b)^7=a^7+7*a^6*b+21*a^5*b^2+35*a^4*b^3+35*a^3*b^4+21*a^2*b^5+7*a*b^6+b^7

Answer 2

a的4次方+4a的三次方b+6a的平方b的平方+4ab的三次方+b的4次方

Answer 3

(a+b)^4=a^4+4a^3b+6a^2b^2+4ab^3+b^4
(a+b)^5=a^5+5a^4b+10a^3b^2+10a^2b^3+5ab^4+b^5
(a+b)^6=a^6+6a^5b+15a^4b^2+20a^3b^3+15a^2b^4+6ab^5+b^6
……

Answer 4

欧湖