2017x2018十2019x2020一2x2018x2019
3个回答
展开全部
2017x2018十2019x2020—2x2018x2019
=(2017x2018 -2018x2019)十(2019x2020 -2018x2019)
=(2019x2020 -2018x2019)-(2018x2019 -2017x2018 )
=2019x(2020-2018)-2018x(2019-2017)
=2019x2-2018x2
=(2019-2018)x2
=1x2
=2
=(2017x2018 -2018x2019)十(2019x2020 -2018x2019)
=(2019x2020 -2018x2019)-(2018x2019 -2017x2018 )
=2019x(2020-2018)-2018x(2019-2017)
=2019x2-2018x2
=(2019-2018)x2
=1x2
=2
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展开全部
2017x2018十2019x2020一2x2018x2019
=2017x2018-2018x2019+2019x2020-2018x2019
=2019x(2020-2018)-2018x(2019-2017)
=2019x2-2018x2
=2x(2019-2018)
=2
=2017x2018-2018x2019+2019x2020-2018x2019
=2019x(2020-2018)-2018x(2019-2017)
=2019x2-2018x2
=2x(2019-2018)
=2
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