4/7×(-5/23)+3/7×(-5/23)-5/23×16/7 求简便方法算
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4/7×(-5/23)+3/7×(-5/23)-5/23×16/7 求简便方法算
4/7×(-5/23)+3/7×(-5/23)-5/23×16/7 求简便方法算
4/7×(-5/23)+3/7×(-5/23)-5/23×16/7 求简便方法算
4/7×(-5/23)+3/7×(-5/23)-5/23×16/7
= 5/23 x ( -4/7 - 3/7 - 16/7 )
= 5/23 x ( -4-3-16) /7
= 5/23 x ( -23 /7 )
= - 7分之5