(-2)^2009×(-0.5)^2009+(-97/14)×7=?2x-1/2[x-1/2(x-1)]=2/3(x-1)
问题描述:
(-2)^2009×(-0.5)^2009+(-97/14)×7=?2x-1/2[x-1/2(x-1)]=2/3(x-1)
答
(-2)^2009×(-0.5)^2009+(-97/14)×7
=[(-2)(-0.5)]^2009-97/2
=1^2009-97/2
=1-97/2
=-95/2
2x-1/2[x-1/2(x-1)]=2/3(x-1)
12x-3[x-1/2(x-1)]=4(x-1)
12x-3[x-1/2(x-1)]=4x-4
8x+4-3[x-1/2(x-1)]= 0
8x+4-3x+3/2(x-1)]= 0
5x+4+3/2(x-1)]= 0
10x+8+3(x-1)= 0
10x+8+3x-3= 0
13x+5=0
x=-5/13