计算题 (-1)눀+(-1⼀2)的-1次方-5÷(3.14-π)的0次方= (要过程

2024-11-30 14:38:35
推荐回答(2个)
回答1:

(-1)²+(-1/2)的-1次方-5÷(3.14-π)的0次方
=1-2-5÷1
=1-2-5
=-6

x²-(x+2)(x-2)-(x+1/x)²
=x²-(x²-4)-(x²+2+1/x²)
x²-x²+4-x²-2-1/x²
=-(x²-2+1/x²)
=-(x+1/x)²

[(x+y)²-(x-y)²]÷(2xy)
=(x²+2xy+y²-x²+2xy-y²)÷(2xy)
=4xy÷(2xy)
=2

回答2:

(-1)²+(-1/2)的-1次方-5÷(3.14-π)的0次方
=1-2-5÷1
=1-2-5
=-6
x²-(x+2)(x-2)-(x+1/x)²
=x²-(x²-4)-(x²+2+1/x²)
x²-x²+4-x²-2-1/x²
=-(x²-2+1/x²)
=-(x+1/x)²
[(x+y)²-(x-y)²]÷(2xy)
=(x²+2xy+y²-x²+2xy-y²)÷(2xy)
=4xy÷(2xy)
=2