若丨a+b+2丨与丨2ab-1丨互为相反数,求式子a+b/3ab-3ab/a+b+1的值.
问题描述:
若丨a+b+2丨与丨2ab-1丨互为相反数,求式子a+b/3ab-3ab/a+b+1的值.
答
若丨a+b+2丨与丨2ab-1丨互为相反数,
丨a+b+2丨+丨2ab-1丨=0
a+b=-2
2ab=1
ab=1/2
a+b/3ab-3ab/a+b+1
=-2/(3x1/2)-(3x1/2)/(-2)+1
=-4/3+3/4+1
=-16/12+9/12+1
=5/12
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