如题所述
124×99+121
=124x(100-1)+121
=124x100-124+121
=12400-(124-121)
=12400-3
=12397
祝你学习进步,有不明白的可以追问!谢谢!!
=124x(100-1)+121
=124x100-124+121
=12400-(124-121)
=12400-3
=12397
祝你学习进步,有不明白的可以追问!谢谢!!
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第1个回答 2013-05-09
原式=(121+3)×99+121
=121×99+121+3×99
=(99+1)×121+3×(100-1)
=100×123+300-3
=12100+300-3
=12397
=121×99+121+3×99
=(99+1)×121+3×(100-1)
=100×123+300-3
=12100+300-3
=12397
第2个回答 2013-05-09
解答
124×99+121
=124×99+124-3
=124×100-3
=12400-3
=12397
满意请采纳,O(∩_∩)O谢谢
124×99+121
=124×99+124-3
=124×100-3
=12400-3
=12397
满意请采纳,O(∩_∩)O谢谢
第3个回答 2013-05-09
124×99+121
=124×(100-1)+121
=124×100-124×1+121
=12400-124+121
=12397×
=124×(100-1)+121
=124×100-124×1+121
=12400-124+121
=12397×
第4个回答 2013-05-09
你好:
124×99+121
=124×99+124-3
=124×(99+1)-3
=124×100-3
=12400-3
=12397
如果题目是124×99+124,解法如下:
124×99+124
=124×(99+1)
=124×100
=12400
124×99+121
=124×99+124-3
=124×(99+1)-3
=124×100-3
=12400-3
=12397
如果题目是124×99+124,解法如下:
124×99+124
=124×(99+1)
=124×100
=12400