3.14X7.5+3.14X2.5

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/11/07 18:00:48

3.14X7.5+3.14X2.5
4.298X3.256-3.256X3.298
1004X996
65²＋2X35X65+35²

3.14X7.5+3.14X2.5
=3.14*(7.5+2.5)
=3.14*10
=31.4
4.298X3.256-3.256X3.298
=3.256*(4.298-3.298)
=3.256*1
=3.256
1004X996
=(1000+4)(1000-4)
=1000²-4²
=1000000-16
=999984
65²＋2X35X65+35²
=(65+35)²
=100²
=10000

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