已知a,b互为相反数,c.d互为倒数,m的绝对值是2,若x=2a+2b/m+cd-1/2m²求5x-{2x+1-2[3x+(5-4x)]}的值
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![已知a,b互为相反数,c.d互为倒数,m的绝对值是2,若x=2a+2b/m+cd-1/2m²求5x-{2x+1-2[3x+(5-4x)]}的值](/uploads/image/z/1020493-37-3.jpg?t=%E5%B7%B2%E7%9F%A5a%2Cb%E4%BA%92%E4%B8%BA%E7%9B%B8%E5%8F%8D%E6%95%B0%2Cc.d%E4%BA%92%E4%B8%BA%E5%80%92%E6%95%B0%2Cm%E7%9A%84%E7%BB%9D%E5%AF%B9%E5%80%BC%E6%98%AF2%2C%E8%8B%A5x%3D2a%2B2b%2Fm%2Bcd-1%2F2m%26%23178%3B%E6%B1%825x-%7B2x%2B1-2%5B3x%2B%285-4x%29%5D%7D%E7%9A%84%E5%80%BC)
已知a,b互为相反数,c.d互为倒数,m的绝对值是2,若x=2a+2b/m+cd-1/2m²求5x-{2x+1-2[3x+(5-4x)]}的值
已知a,b互为相反数,c.d互为倒数,m的绝对值是2,若x=2a+2b/m+cd-1/2m²
求5x-{2x+1-2[3x+(5-4x)]}的值
已知a,b互为相反数,c.d互为倒数,m的绝对值是2,若x=2a+2b/m+cd-1/2m²求5x-{2x+1-2[3x+(5-4x)]}的值
a+b=0
cd=1
m=±2
所以m²=4
x=2(a+b)/m+1-1/2*4
=0+1-2
=-1
原式=5x-2x-1+2(3x+5-4x)
=3x-1+2(5-x)
=3x-1+10-2x
=x+9
=-1+9
=8