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3.9 1.3x5 简便运算

3.9÷(1.3x5)=3.9÷1.3÷5=3÷5=0.6请采纳

3.9=39/10 1.3=13/10 1.3*5=13/10*5=65/103.9-(1.3x5)=39/10-65/10=-2.6

3.9÷(1.3x4)=3.9÷1.3÷4=3÷4=0.75

3.9÷小括号1.3*0.6.简便计算就是去掉小括号.变成3.9÷1.3÷0.6=5.

3.9÷(1.3x5)+4.78=3.9÷1.3÷5+4.78=3÷5+4.78=0.6+4.78=5.38谢谢,请采纳

=(1.3*3)÷(1.3*6)=3÷6=1/2

3.9(1.3x6)=4(1.3X6)-0.1X(1.3X6)=4X7.8-0.78=31.2-1+0.22=30.2+0.22=30.42

3.9÷(1.3*5) 解:简便计算 =3.9÷1.3÷5 =3÷5 =0.6 祝学习进步.

4.5÷1.8=(5*0.9)÷(2*0.9)=5÷2=2.53.9÷(1.3*5)=3.9÷1.3÷5=3÷5=0.6如果我的回答对你有帮助,请及时选为满意答案,谢谢~~

7.8÷(1.3x5)=7.8÷1.3÷5=6÷5=1.2

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