Question

计算 3-[（-3）-10] -24+26-42+18 (-42)+(-18)-(+36)-(-24) (+0.125)+(+3 1/4)+(-3 1/8)-1/8-(-1/4)

Answer 1

3-[（-3）-10]
=3-（-3-10）
=3-（-13）
=3+13
=16

-24+26-42+18
=-(24+42)+(26+18)
=-66+44
=-22

(-42)+(-18)-(+36)-(-24)
=-42-18-36+24
=-60-36+24
=-96+24
=-72

(+0.125)+(+3 1/4)+(-3 1/8)-1/8-(-1/4)
=0.125+3.25-3.125-0.125+0.25
=(0.125-0.125)+(3.25+0.25)-3.125
=0+4-3.125
=0.875
=7/8

Answer 2

集合元素有互异性
所以x≠3

x²-2x≠3
x²-2x-3=(x-3)(x+1)≠0
x≠3,x≠-1

x≠x²-2x
x(x-3)≠0
x≠0,x≠3

所以x≠3且x≠-1且x≠0