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3.09 0.15竖式

①2.5+(6.2-2.6)+1.8=2.5+3.6+1.87.9;②119-(42.5+1.6+3.6)119-47.7=71.3;③7.24+(3.1-3.09)=7.24+0.01=7.25;④[0.15+(2.4-1.8)]*20=[0.15+0.6]*20=0.75*20=15;⑤0.78*[12-(1.45+3.8)]=0.78*[12-5.25]=0.78*6.75=5.265;⑥9.07-22.78÷3.4=9.07-6.7=2.37.

2.94/1.05=294/105=14/5就ok了

4.01

(1)3.09千克=3090克; (2)15分=0.15元;(3)9千米56米=9.056千米; (4)36厘米=0.36米;(5)20平方米3平方分米=20.03平方米=2003平方分米.故答案为:3090,0.15,9.056,0.36,20.03,2003.

05 =15.6*2-1.6*0.52-3.2-0.08 =12.32-0.08 =1215.52-1.6*2.05 =15.52-1

3.09*3.9÷26=3.09*(3.9÷26)=3.09*0.15=0.4635

3.09*3.9÷26=3.09*3.9÷26=0.4635其中3.9=13*0.3 26=13*2以下约分化简计算,希望能帮到您.

1 0.4 2 0.15 3 0.125 4 0.3680

0.86+12.98=13.8410.2-3.76=6.444.8*0.15=0.726.21÷0.3=20.7

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