2021✖️20202019一2019✖️20202021巧算怎么算?
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根据题毕拿拍目的简便计算手羡,可敏弯以这样计算。
2021×20202019-2019×20202021
=(2020+1)×(20202020-1)-(2020-1)×(20202020+1)
=2020×20202020+20202020-2020-1-2020×20202020+20202020-2020+1
=(20202020-2020)×2
=40400000
2021×20202019-2019×20202021
=(2020+1)×(20202020-1)-(2020-1)×(20202020+1)
=2020×20202020+20202020-2020-1-2020×20202020+20202020-2020+1
=(20202020-2020)×2
=40400000
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2021x20202019-2019x20202021
=2021x(20202020-1)-2019x(20202020+1)
=2021x20202020-2021-2019x20202020-2019
=20202020x(2021-2019)脊陪-(2021+2019)
=20202020x2-2020x2
=2020x2x(银野塌锋圆10001-1)
=40400000
=2021x(20202020-1)-2019x(20202020+1)
=2021x20202020-2021-2019x20202020-2019
=20202020x(2021-2019)脊陪-(2021+2019)
=20202020x2-2020x2
=2020x2x(银野塌锋圆10001-1)
=40400000
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2021×202019-2019×202021,
=(2019+2)×20202019-2019×20202019+2)
=2019×20202019+2×20202019-2019×20202019-2019×2
=友租谨卖2×20200000
=好晌兆40400000
=(2019+2)×20202019-2019×20202019+2)
=2019×20202019+2×20202019-2019×20202019-2019×2
=友租谨卖2×20200000
=好晌兆40400000
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2021x20202019-2019x20202021巧算激激可以如下兄纯:
2021x20202019-2019x20202021=(2020+1)明尘袜x(20202020-1)-(2020-1)x(20202020+1)=2020x20202020-2020+20202020-1-(2020x20202020+2020-20202020-1)=40400000
2021x20202019-2019x20202021=(2020+1)明尘袜x(20202020-1)-(2020-1)x(20202020+1)=2020x20202020-2020+20202020-1-(2020x20202020+2020-20202020-1)=40400000
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2o21x2o2o2o19一2o19x2o2o2019二咐中兆培芦2o2ox2o2o202o一2o2ox2o2o202o二2o2o2o2ox(2o2o一2020)二2o20202oxo=衡租o
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