神马作文网[(-3)²-(-5)²]÷(-2)
![[(-3)²-(-5)²]÷(-2)](/uploads/image/z/17412833-65-3.jpg?t=%5B%28-3%29%26%23178%3B-%28-5%29%26%23178%3B%5D%C3%B7%28-2%29)
1²+2²+3²+4²+5²
2×（-5）+2²-3÷2分之1
(1)4a²b/3cd²×5c²d/4ab²÷2ab/3d
(（x²-5x+6)/(12-7x+x²))²÷((x²+3x+2)/(x
ab²÷2c²×4cd÷－3a²b²
[（-3a∧5）²÷（-a²）³+3a²（2a²-4a）]÷（-3a&
( )÷(-2a²)=-2+3a-4a²+5a³
求和：1²-2²+3²-4²+5²-6²+…+99²
证明：1²+2²+3²+4²+5²+6²+.+k²
（1-2²）+3²-4²+5²-6²+7²-8²+
1²-2²+3²-4²+5²-6²+7²-8
x²-2x-3分之16-x²÷x-3分之x²-5x+4