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信息发布者:
C
1
3
$a\leq1$
$ \begin{aligned}解:原式&=\frac 12+5 \\ &=5\frac{1}{2} \\ \end{aligned}$
$ \begin{aligned}解:原式&=\sqrt {(π-1)^2} \\ &=π-1 \\ \end{aligned}$
$ \begin{aligned}解:原式&=3+3 \\ &=6 \\ \end{aligned}$

:原式=a2

$ \begin{aligned}解:原式&=\sqrt {(2x-1)^2} \\ &=2x-1 \\ \end{aligned}$
$ \begin{aligned} 解:原式&=\sqrt {(y-3)^2} \\ &=y-3 \\ \end{aligned}$
解:由题图可知$a\lt b\lt0\lt c,$
$\therefore a - b\lt0,$$c - a\gt0,$$b - c\lt0。$
$\therefore$原式$=-(a - b)-(c - a)+[-(b - c)]$
$=-a + b - c + a - b + c = 0。$
A
B