用简便方法计算:(1)(-19)×91+91×(-81) (2)(-36)×200╮7/18(1)(-19)×91+91×(-81)(2)(-36)×两百又7/18

来源:学生作业帮助网 编辑:作业帮 时间:2024/05/03 17:11:10
用简便方法计算:(1)(-19)×91+91×(-81) (2)(-36)×200╮7/18(1)(-19)×91+91×(-81)(2)(-36)×两百又7/18

用简便方法计算:(1)(-19)×91+91×(-81) (2)(-36)×200╮7/18(1)(-19)×91+91×(-81)(2)(-36)×两百又7/18
用简便方法计算:(1)(-19)×91+91×(-81) (2)(-36)×200╮7/18
(1)(-19)×91+91×(-81)
(2)(-36)×两百又7/18

用简便方法计算:(1)(-19)×91+91×(-81) (2)(-36)×200╮7/18(1)(-19)×91+91×(-81)(2)(-36)×两百又7/18
=91×(19+81)
=91×100
=9100
36×(200+7/18)
=36×200+36×7/18
=7200+14
=7214