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17.5*2.1/3.5脱式计算

17.5-17.5チ✘0.2的脱式计算? 17.5-17.5チ✘0.2 =17.5*(1-0.2) =17.5*0.8 =14

你好! 17.5╳2.02 =17.5×(2+0.02) =17.5×2+17.5×0.02 =35+0.35 =35.35 如果对你有帮助望采纳

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。

5/17-4/51+2/3 =15/51-4/51+2/3 =11/51+2/3 =11/51+34/51 =45/51 =15/17 望采纳

17/20-(2/5+19/20) =17/20-(8/20+19/20) =17/20-27/20 =-10/20 =-1/2 3/10+1/3+1/10 =9/30+10/30+3/30 =19/30+3/30 =22/30 =11/15

(1)17.5÷12.5×1.4,=1.4×1.4,=1.96;(2)1.58×99+1.58,=1.58×(99+1),=1.58×100,=158;(3)4.38÷0.125÷8,=4.38÷(0.125×8),=4.38÷1,=4.38;(4)6.4×4.5+3.6×4.5,=(6.4+3.6)×4.5,=10×4.5,=45.

(1)17.5-5.15-1.85=17.5-(5.15+1.85)=17.5-7=10.5 (2)800×0.7×0.125=0.7×(800×0.125)=0.7×100=70(3)3.54×0.14-0.14×2.54 =0.14×(3.54-2.54)=0.14×1=0.14 (4)4.1×9.9=4.1×(10-0.1)=4.1×10-4.1×0.1=41-0.41=40.59

17.5-6.3+3.7 =11.2+3.7 =14.9

17.5÷5+6.5x2 =35+13 =48 谢谢,请采纳

37.5x1.7+6.25x17 =37.5x1.7+62.5x1.7 =(37.5+62.5)x1.7 =100x1.7 =170

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