(数学)计算.

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(数学)计算.(数学)计算.(数学)计算.原式=(-1000)x(0.3-0.5+0.2-0.1)=(-1000)x(0.3+0.2-0.5-0.1)=(-1000)x(0.5-0.5-0.1)=-1

(数学)计算.
(数学)计算.

(数学)计算.
原式=(-1000)x(0.3-0.5+0.2-0.1)
=(-1000)x(0.3+0.2-0.5-0.1)
=(-1000)x(0.5-0.5-0.1)
=-1000x(-0.1)
=100