Question

87X86/3用简便方法怎么算？

Answer 1

　　87X86/3
=(86+1)×86/3
=86×86/3+86/3
=3又86/3

希望能帮到你， 祝你学习进步，不理解请追问，理解请及时采纳！(*^__^*)

Answer 2

87x86/3
=29X3X86/3
=29X86
=(30-1)X86
=30X86-86
=2580-86
=2494
希望能帮你忙，不懂请追问，懂了请采纳，谢谢

追问

8分子5乘以7加8分子1乘以5
6分子5乘以25减6分子1乘以85用简便方法计算

追答

=5/8X7+1/8x5
=5/8x(7+1)
=5/8x8
=5

=5/6x25-1/6x85
=5/6x25-5/6x17
=5/6x(25-17)
=5/6x8
=20/3

追问

没看清题吧，答案的数字和题不一样呀

追答

答案一个是5 一个是3分之20，对的，我检验过了

追问

第一个从哪来的5/8X（7+1) 第二个从哪里来的5/6X25-5/6x17，这两个就和本题不一样的数字，请你再看看我问的数字

追答

你反应好慢
=5/8X7+1/8x5
=5/8X7+5/8x1
=5/8x(7+1)
=5/8x8
=5

=5/6x25-1/6x85
=5/6x25-5/6x17
=5/6x(25-17)
=5/6x8
=20/3

85=5x17

Answer 3

计算器
等于2494