988×87-989×86
=988×87-(988+1)×86
=988×87-988×86-1×86
=988×(87-86)-86
=988×1-86
=988-86
=902
很高兴为您解答,【the 1900】团队为您答题.
请点击下面的【选为满意回答】按钮.
988×87-989×86
=988×87-(988+1)×86
=988×87-988×86-1×86
=988×(87-86)-86
=988×1-86
=988-86
=902
很高兴为您解答,【the 1900】团队为您答题.
请点击下面的【选为满意回答】按钮.