(1000+123+234)×(123+234+345)-(1000+123+234+345)×(123+234)简便运算

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(1000+123+234)×(123+234+345)-(1000+123+234+345)×(123+234)简便运算
(1000+123+234)×(123+234+345)-(1000+123+234+345)×(123+234)
简便运算

(1000+123+234)×(123+234+345)-(1000+123+234+345)×(123+234)简便运算
(1000+123+234)×(123+234+345)-(1000+123+234+345)×(123+234)
=1000(123+234+345)+(123+234)(123+234+345)-1000(123+234)-(123+234+345)(123+234)
=1000(123+234+345)-1000(123+234)
=1000*345
=345000

345000

et

345000

698547.85