97乘88减98乘87等于多少

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97乘88减98乘87等于多少97乘88减98乘87等于多少97乘88减98乘87等于多少97x88-98x87=(98-1)x88-98x87=98x88-88-98x87=98x(88-87)-8

97乘88减98乘87等于多少
97乘88减98乘87等于多少

97乘88减98乘87等于多少
97x88-98x87
=(98-1)x88-98x87
=98x88-88-98x87
=98x(88-87)-88
=98-88
=10

10

97*88-98*87
=97*(87+1)-(97+1)*87
=97*87+97-97*87-87
=10

10

10

原式=97*87+97-97*87-87
=97-87
=10