1.345*0.345*2.69-1.345的3次方-1.345*0.345的平方

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1.345*0.345*2.69-1.345的3次方-1.345*0.345的平方

1.345*0.345*2.69-1.345的3次方-1.345*0.345的平方
1.345*0.345*2.69-1.345的3次方-1.345*0.345的平方

1.345*0.345*2.69-1.345的3次方-1.345*0.345的平方
原式=-1.345(1.345的2次方-2*0.345*1.345+0.345的平方)
=-1.345(1.345-0.345)
=-1.345
用完全平方公式 a^2-2ab+b^2=(a-b)^2

1.345*0.345*2.69-1.345^3-1.345*0.345^2
=1.345*0.345(2.69-0.345)-1.345^3
=1.345*0.345*2.345-1.345^3
=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.

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

1.345*(2*0.345*1.345-1.345^2-0.345^2)=
-1.345*(1.345-0.345)^2=-1.345