先化简,再求值,x
2017-09-28
展开全部
4x•x+(2x-1)(1-2x)
=4x^2-(2x-1)(2x-1)
=4x^2-(4x^2-2x+1)
=4x^2-4x^2+4x-1
=4x-1
当x=1/40时
原式=4*1/40-1
=1/10-1
=-9/10
=4x^2-(2x-1)(2x-1)
=4x^2-(4x^2-2x+1)
=4x^2-4x^2+4x-1
=4x-1
当x=1/40时
原式=4*1/40-1
=1/10-1
=-9/10
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