.已知:x=4,y=8,求代数式1/7xy^2*14(xy)^2*1/4x^5的值要先解代数式,再把数带进去,要过程讲解

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.已知:x=4,y=8,求代数式1/7xy^2*14(xy)^2*1/4x^5的值要先解代数式,再把数带进去,要过程讲解
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.已知:x=4,y=8,求代数式1/7xy^2*14(xy)^2*1/4x^5的值要先解代数式,再把数带进去,要过程讲解
.已知:x=4,y=8,求代数式1/7xy^2*14(xy)^2*1/4x^5的值
要先解代数式,再把数带进去,要过程讲解

.已知:x=4,y=8,求代数式1/7xy^2*14(xy)^2*1/4x^5的值要先解代数式,再把数带进去,要过程讲解
1/7xy^2*14(xy)^2*1/4x^5
=2x^3y^4*1/4x^5
=1/2x^8y^4
=1/2x(4)^8x(8)^4
=1/2x (2^16)x(2^12)
=1/2x2^28
=2^27


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1/7xy^2*14(xy)^2*1/4x^5
=1/2x^(1+2+5)y^(2+2)
=1/2x^8y^4
x=4,y=8
1/7xy^2*14(xy)^2*1/4x^5=1/2*4^8*8^4
=1/2*2^16*2^12
=2^278^4怎莫算的?(8)^4不应该是1/8^4吗?8^4=(2^3)^4=2^3*2^3*2^3*2^3=2^(3...

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1/7xy^2*14(xy)^2*1/4x^5
=1/2x^(1+2+5)y^(2+2)
=1/2x^8y^4
x=4,y=8
1/7xy^2*14(xy)^2*1/4x^5=1/2*4^8*8^4
=1/2*2^16*2^12
=2^27

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