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3.5+6.5+1.7用脱式计算

3.5+6.5+1.7用脱式计算 3.5+6.5+1.7 =10+1.7 =11.7, 请采纳,谢谢.

=(3.5+6.5)+1.7×1.7 =10+2.89 =12.89 你好,本题已解答,如果满意,请点右上角“采纳答案”,支持一下。

2/3+5/6+1/7脱式计算 =28/42+35/42+6/42 =69/42 =1又27/42

解: 1+3+5+7…+17+19 =(1+19)×10÷2 =20×10÷2 =100 方法提示:根据和=(首项+未项)×项数÷2,先分别求出它们的和,再求总和。

3/5x1/6x5/7 =1/10x5/7 =1/14

用脱式计算计算 一点6×7点5×1点二五 =12×1.25 =15

(1+3+5+7+…+2003)-(2+4+6++8+…+2002) =1+(3-2)+(5-4)+.....+(2003-2002) =1+1x1001 =1002

red

1+2+3+4+5+6+7...+15+17+19 =(1+19)X[(19-1)÷2+1]÷2 =20X10÷2 =100

6/7×4/5×14 =6/7×14 ×4/5 =12×4/5 =9又3/5

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