如题所述
3.5*4分之5+1.25*2.7+3.8÷5分之4
=1.25*3.5+1.25*2.7+1.25*3.8
=1.25*(3.5+2.7+3.8)
=1.25*10
=12.5
999又2分之1+99又4分之3+9又8分之7+9又8分之7
=1000-1/2+100-1/4+10-1/8+10-1/8
=1000+100+10+10-(1/2+1/4+1/8+1/8)
=1120-1
=1119
不懂可追问,有帮助请采纳,谢谢!
=1.25*3.5+1.25*2.7+1.25*3.8
=1.25*(3.5+2.7+3.8)
=1.25*10
=12.5
999又2分之1+99又4分之3+9又8分之7+9又8分之7
=1000-1/2+100-1/4+10-1/8+10-1/8
=1000+100+10+10-(1/2+1/4+1/8+1/8)
=1120-1
=1119
不懂可追问,有帮助请采纳,谢谢!
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第1个回答 2012-11-27
3.5*4分之5+1.25*2.7+3.8÷5分之4
=1.25*3.5+1.25*2.7+1.25*3.8
=1.25*(3.5+2.7+3.8)
=1.25*10
=12.5
祝学习进步,望采纳,不懂的欢迎追问。。。
=1.25*3.5+1.25*2.7+1.25*3.8
=1.25*(3.5+2.7+3.8)
=1.25*10
=12.5
祝学习进步,望采纳,不懂的欢迎追问。。。
第2个回答 2012-11-27
3.5*4分之5+1.25*2.7+3.8÷5分之4
=3.5×5/4+5/4×2.7+3.8×5/4
=﹙3.5+2.7+3.8﹚×5/4
=10×5/4
=10×1.25
=12.5
=3.5×5/4+5/4×2.7+3.8×5/4
=﹙3.5+2.7+3.8﹚×5/4
=10×5/4
=10×1.25
=12.5