Question

A=5a^3 x b^4 với a=1,b=1

a=9a^5 x b^2 với a=-1,b=2

C=ax+ay+bx+by với a+b=-2,x+y=17

Answer 1

\(A=5.a^3.b^4\)

\(A=5.1^3.1^4\)

\(\Rightarrow A=5\)

Answer 2

\(B=9.a^5.b^2\)

\(B=9.\left(-1\right)^5.2^2\)

\(B=9.\left(-1\right).4\)

\(B=-9.4=-36\)

Answer 3

\(C=ax+ay+bx+by\)

\(C=x.\left(a+b\right)+y.\left(a+b\right)\)

\(C=\left(a+b\right).\left(x+y\right)\)

\(C=\left(-2\right).\left(17\right)=-34\)