(123×124+125)-(125×124+123)的简便计算怎么算

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(123×124+125)-(125×124+123)的简便计算怎么算(123×124+125)-(125×124+123)的简便计算怎么算(123×124+125)-(125×124+123)的简便

(123×124+125)-(125×124+123)的简便计算怎么算
(123×124+125)-(125×124+123)的简便计算怎么算

(123×124+125)-(125×124+123)的简便计算怎么算
=(123x125-123+125)-(125x123+125+123)
=2-(125+123)
=2-248
=-246
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(123×124+125)-(125×124+123)
=123×124+125-125×124-123
=(123×124-125×124)+(125-123)
=124×(123-125)+2
=124×(-2)+2
=-248+2
=-246对不起啊,我写错了是(123×124+125)-(125×124-123)的简便计算怎么算(123×12...

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(123×124+125)-(125×124+123)
=123×124+125-125×124-123
=(123×124-125×124)+(125-123)
=124×(123-125)+2
=124×(-2)+2
=-248+2
=-246

收起

直接去括号就行了
(123×124+125)-(125×124+123)
=123×124-125×124+2
=124×(123-125)+2
=-248+2
=-246

原式=123*124+125-125*124-123
=123*(124-1)+125*(1-124)
=123*123-125*123
=123*(123-125)
=123*(-2)
=-246