Question

1.345*0.345*2.69-1.345^3-1.345*0.345^2

Answer 1

1.345*0.345*2.69-1.345^3-1.345*0.345^2
=-1.345*(-2*0.345*1.345+1.345^2+0.345^2)
=-1.345*(1.345-0.345)^2
=-1.345*1
=-1.345

Answer 2

解：设1.345=a
a[(a-1)2a-a^2-(a-1)^2]
=a[2a^2-2a-a^2-(a^2+1-2a)]
=a(2a^2-2a-a^2-a^2-1+2a)
=a(-1)
1.345*(-1)
=-1.345

Answer 3

1.345*(0.345*2.69-1.345^2-0.345^2)
括号里面是(1.345-0.345)^2
所以结果就是1.345

Answer 4

1.345*0.345*2.69-1.345^3-1.345*0.345^2
=1.345*(0.345*2.69-1.345^2-0.345^2)
=1.345*[0.345*(2.69-0.345)-1.345^2]
=1.345*(0.345*2.345-1.345^2)
=1.345*[(1.345-1)(1.345+1)-1.345^2]
=1.345*(1.345^2-1-1.345^2)
=1.345*(-1)
=-1.345