1, root number 25=(5
)
The square roots of 2 and 9 are (
3)
3, -0.5 is (-root number 0.25.
The square root of)
The square root of .4,0.169 is (plus or minus 13.
)
5,+-plus or minus 1/3 is the square root of a, then a=( 1/9.
)
6. If x=7 under the radical sign, then x=(49
)
7. if a2=b, then b is a (
Square number), a is b (
Square root)
8. When x=5, the square root of (x-9)2 under the radical sign is (
4)
Second, multiple choice questions
1, - 125 (-5
)
The value of (-2)3 under roots 2 and 3 is (
-2)
3. The cube root is equal to its own number (plus or minus 1 and 0.
)
4. If (3x+2)3- 1=6 1/64, then x= (
-0.25)
5. The cube root of a number is equal to the arithmetic square root of this number. Then this number is equal to (
1 and 0)
6. If (x-2)2=9, then x is (5.
)
1 has a square with a side length of 5cm and a rectangle with a length of 8cm and a width of 18cm. To make a square with an area equal to the sum of these two figures, how long should the side be? 2. It is known that y=x3- 1 1, and the arithmetic square root of y is 4. Find the value of x.3, the radius r of the ball, the volume of the ball is 500cm2, (V ball =4/3πr2), and find the value of R, (π takes 3. 14, accurate to 0.006544.
4. a+2b=3 under the known radical number, and 4a-2b=4 under the radical number. Find the value of a-B.
Sum of areas = square area+rectangular area = 5 * 5+8 *18 = 25+144 = 169 (square centimeter)169 The square root is positive and negative 13, so take a positive number.
Because the arithmetic square root of y is 4, so substitute y = 4 2 =16 into y=x3- 1 1.
16=X^3- 1 1
X^3=27
X= 3
V=4/3πr^3
=500
πr^3=500*3/4
r^3
=
1500/4π
= 159.236
r= 10.928
a+2b=9
4a-2b= 16
5a=25 is known.
a=5
b=2
So a-b=3.