1.sign 2.rubbish 3.contributions 4.A 5.B 1、因为x-2x+5=（x-1）^2+4>=4>0 所以x可取所有实数 3、因为根号下的数值有意义必须是x等于正负1 又因为分母不为零 所以x只能等于-1 此时y=-1/2 所以x-6y=1-6*（-1/2）=4
1、The s______ "THIS SIDE UP" is often seen on a box.2、Don't
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