如题所述
第1个回答 2011-06-23
98×74
=(100-2)×74
=100×74-2×74
=7400-2×(75-1)
=7400-2×75+2
=7400-150+2
=7250+2
=7252本回答被网友采纳
=(100-2)×74
=100×74-2×74
=7400-2×(75-1)
=7400-2×75+2
=7400-150+2
=7250+2
=7252本回答被网友采纳
第2个回答 2011-06-23
=(100-2)X74
=7400-148
=7252
=7400-148
=7252
第3个回答 2011-06-23
98x74
=(100-2)x74
=7400-148
=7252
=(100-2)x74
=7400-148
=7252
