Question

计算：-6又7/9-【3/2*（-4/5）+0.2+1又3/5÷1又1/7】（写过程）

Answer 1

-6又7/9-【3/2*（-4/5）+0.2+1又3/5÷1又1/7】
=-6又7/9+6/5-0.2-8/5÷8/7
=-6又7/9+6/5-0.2-7/5
=-6又7/9-2/5
=-7又8/45

Answer 2

A元素是y
y=-(x-1)²+2<=2

B元素是x
则根号下大于等于0
2x-1>=0
x>=1/2

所以A∩B={a |1/2<=a<=2}