(2.15﹢5.17+3.62)×(5.17+2.15+8.5)-(3.62+2.15+8.5+5.17)×(2.15+
来源:学生作业帮 编辑:搜搜考试网作业帮 分类:数学作业 时间:2024/06/24 05:39:27
(2.15﹢5.17+3.62)×(5.17+2.15+8.5)-(3.62+2.15+8.5+5.17)×(2.15+5.17)用简便方法计算
![(2.15﹢5.17+3.62)×(5.17+2.15+8.5)-(3.62+2.15+8.5+5.17)×(2.15+](/uploads/image/z/3534216-24-6.jpg?t=%282.15%EF%B9%A25.17%EF%BC%8B3.62%29%C3%97%285.17%EF%BC%8B2.15%EF%BC%8B8.5%29%EF%BC%8D%283.62%EF%BC%8B2.15%EF%BC%8B8.5%EF%BC%8B5.17%29%C3%97%282.15%EF%BC%8B)
原式=[(2.15+5.17)+3.62]×[(2.15+5.17)+8.5]-[3.62+8.5+(2.15+5.17)]×(2.15+5.17)
=(2.15+5.17)²+3.62×(2.15+5.17)+8.5×(2.15+5.17)+3.62×8.5-[3.62×(2.15+5.17)+8.5×(2.15+5.17)+(2.15+5.17)²]
=(2.15+5.17)²+3.62×(2.15+5.17)+8.5×(2.15+5.17)+3.62×8.5-3.62×(2.15+5.17)-8.5×(2.15+5.17)-(2.15+5.17)²
=3.62×8.5
=3.62×(9-0.5)
=3.62×9-3.62×0.5
=32.58-1.81
=30.77
或者:
令a=2.15+3.17
原式=(a+3.62)×(a+8.5)-(3.62+8.5+a)×a
=a²+3.62a+8.5a+3.62×8.5-(3.62a+8.5a+a²)
=a²+3.62a+8.5a+3.62×8.5-3.62a-8.5a-a²
=3.62×8.5
=3.62×(9-0.5)
=3.62×9-3.62×0.5
=32.58-1.81
=30.77
=(2.15+5.17)²+3.62×(2.15+5.17)+8.5×(2.15+5.17)+3.62×8.5-[3.62×(2.15+5.17)+8.5×(2.15+5.17)+(2.15+5.17)²]
=(2.15+5.17)²+3.62×(2.15+5.17)+8.5×(2.15+5.17)+3.62×8.5-3.62×(2.15+5.17)-8.5×(2.15+5.17)-(2.15+5.17)²
=3.62×8.5
=3.62×(9-0.5)
=3.62×9-3.62×0.5
=32.58-1.81
=30.77
或者:
令a=2.15+3.17
原式=(a+3.62)×(a+8.5)-(3.62+8.5+a)×a
=a²+3.62a+8.5a+3.62×8.5-(3.62a+8.5a+a²)
=a²+3.62a+8.5a+3.62×8.5-3.62a-8.5a-a²
=3.62×8.5
=3.62×(9-0.5)
=3.62×9-3.62×0.5
=32.58-1.81
=30.77
(2.15﹢5.17+3.62)×(5.17+2.15+8.5)-(3.62+2.15+8.5+5.17)×(2.15+
计算【2.15+5.17+3.62】乘【5.17+2.15+8.5】-【3.62+2.15+8.5+5.17】乘【2.1
4.02+5.4+0.98 5.17-1.8-3.2 13.75-(3.75+6.48)
4.2-1.38+5.8-3.62简便计算
111+222+333+444+555+666+777+888++++++++++++++++++++++999=?
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(2010+2008+2006+.+2)-(1+3+5+.+2009)
(9999+9997+.+9001)-(1+3+.+999)
1.(2+4+6+.1984+1986+1988)-(1+3+5+.+1985+1987)=?
(+1)+(-2)+(+3)+(-4)++(+99)+(-100)等于几?
计算:(+1)+(-3)+(+5)+(-7)+⋯+(+97)+(-99)