GRE

The perimeter of a rectangle with area 16

The perimeter of a rectangle with area 24

w▼z

z▼w

AB+BC

AC

Probability of getting exactly two heads

Probability of getting exactly one tail

a

2b

Circumference of the circle

12π

y

The average (arithmetic mean) of x and z

$$The sum of the roots of x^{2}-9x+20=0$$

$$x^{2}+6x+8=0$$

25000 +道题目

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