mathjax语法

1. $ a ^ 2 + b ^ 2 = c ^ 2 $

2. $ ax ^ 2 + bx + c = 0 $

3. $ x = \ dfrac {-b \ pm \ sqrt {b ^ 2 - 4ac}}}}}}}}}}}}}} {2a} $

4. $ m = \ dfrac {y_2 - y_1} {x_2 - x_1} = \ dfrac {\ delta y} {\ delta x} $

5. $ f'（x）= \ lim \ limits _ {\ delta x \ to 0} \ dfrac {f（x + \ delta x）-f（x）} {\ delta x} $

6. $ \ dfrac {d} {dx} \ left [[x ^ n \ recten] = nx ^ {n - 1} $

7. $ \ int_a ^ b f（x）〜dx = \左[[f（x）\右] _a ^ b = f（b） - f（a）$

8. $ \ int_a ^ b f（x）〜dx = f（c）（b - a）$

9. $ \ text {平均值} = \ dfrac {1} {（b-a）} \ int_a ^ b f（x）〜dx $

10. $ \ dfrac {d} {dx} \ left [[\ int_a ^ x f（t）〜dt \ recten] = f（x）$

1。$ a ^ 2 + b ^ 2 = c ^ 2 $ 2。$ ax ^ 2 + bx + c = 0 $ 3。$ x = \ dfrac {-b \ pm \ sqrt {b ^ 2  -  4ac}}}}}}}} {2a} $ 4。$ m = \ dfrac {y_2  -  y_1} {x_2  -  x_1} = \ dfrac {\ delta y} {\ delta x} $ 5。$ f'（x）= \ lim \ limits _ {\ delta x \ to 0} \ dfrac {f（x + \ delta x）-f（x）} {\ delta x} $ 6。$ \ dfrac {d} {dx} \ left [[x ^ n \ recten] = nx ^ {n  -  1} $ 7。$ \ int_a ^ b f（x）〜dx = \左[[f（x）\右] _a ^ b = f（b） -  f（a）$ 8。$ \ int_a ^ b f（x）〜dx = f（c）（b  -  a）$ 9。$ \ text {平均值} = \ dfrac {1} {（b-a）} \ int_a ^ b f（x）〜dx $ 10。 $\dfrac{d}{dx} \left [[\int_a^x f(t)~dt \right ] = f(x)$