作业帮(1)x^3·x^5+x·x^3 (2)(-5)^2×25×（-5）^4(1)x^3·x^5+x·x^3 (2)(-5)^2×25×（-5）^4
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(1)x^3·x^5+x·x^3 (2)(-5)^2×25×（-5）^4(1)x^3·x^5+x·x^3 (2)(-5)^2×25×（-5）^4
(1)x^3·x^5+x·x^3 (2)(-5)^2×25×（-5）^4
(1)x^3·x^5+x·x^3 (2)(-5)^2×25×（-5）^4
(1)x^3·x^5+x·x^3 (2)(-5)^2×25×（-5）^4(1)x^3·x^5+x·x^3 (2)(-5)^2×25×（-5）^4
(1)x^3·x^5+x·x^3
=x^8+x^4
(2)(-5)^2×25×（-5）^4
=5²×5²×5^4
=5^8
(1)x^3·x^5+x·x^3
=x^(3+5)+x^(1+3)
=x^8+x^4
(2)(-5)^2×25×（-5）^4
=(-5)^2×(-5)^2×（-5）^4
=(-5)^(2+2+4)
=(-5)^8
=5^8
(1)x^4(x^4+1) (2)5^(2+2+2+2)=5^8=1953125
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