Toán 9 giữa kỳ 1- lượt 1

A. 5                

B. 625               

C. -5                    

D. -625

$$\sqrt[]{\frac{a}{b}}=\frac{\sqrt{a}}{\sqrt{b}}\ với\ \ a\ge0;\$$  

$$\sqrt[]{\frac{a}{b}}=\frac{\sqrt{a}}{\sqrt{b}}\ với\ \ a\ge0;\ b>0$$  

$$\sqrt[]{\frac{a}{b}}=\frac{\sqrt{a}}{\sqrt{b}}\ với\ \ a;\ b\epsilon R$$  

$$\sqrt[]{\frac{a}{b}}=\frac{\sqrt{a}}{\sqrt{b}}\ với\ \ \frac{a}{b}\ge0$$  

A.3

B.7                    

C.27                        

D.23

$$A.x>1$$  

$$B.x<1$$  

$$C.x\ge1$$  

$$D.x\le1$$  

$$A.m\ge3$$  

$$B.m>3$$  

$$C.m\ne3$$  

$$D.m<3$$  

$$A.\sqrt{6}-1$$  

$$B.1-\sqrt{6}$$  

$$C.\sqrt{2}-\sqrt{3}$$  

$$D.\sqrt{3}-\sqrt{2}$$  

$$A.\ \frac{1}{9}\sqrt[]{15}$$  

$$B.\ \frac{1}{6}\sqrt[]{30}$$  

$$B.\ \frac{1}{6}\sqrt[]{5}$$  

$$\frac{\sqrt[]{15}}{\sqrt[]{18}}$$  

$$A.4(\sqrt{3}+1)$$  

$$B.\sqrt{3}+1$$  

$$C.\frac{\sqrt[]{3}+1}{2}$$  

$$D.2\sqrt{3}+2$$  

$$A.∀x$$  

$$B.∀x\ge0$$  

$$C.∀x\le1$$  

$$D.∀x:0\le x\le1$$  

$$A.3\sqrt{5}>6$$  

$$B.-3\sqrt{7}>-\sqrt{36}.\sqrt{2}$$  

$$C.4\sqrt{3}-\sqrt{6}<\sqrt{4}8-\sqrt{7}$$  

$$D.\sqrt{78}:\sqrt{2}<2.\sqrt{10}$$