Question

一。3.9x1.4÷0.35二。0.13x102三。0.5x2.33x4四。9.07-22.78÷34 。能用简便算法的要用

Answer 1

(1) 3.9x1.4÷0.35=3.9x.(1.4÷0.35)=3.9x4=(4-0.1)x4=16-0.4=15.6
(2) 0.13x102=0.13x(100+2)=13+0.26=13.26
(3) 0.5x2.33x4=0.5x4x2.33=2x2.33=4.66
(4) 9.07-22.78÷34=9.07-(17+5.78)÷34=9.07-(0.5+0.17)=8.9-0.5=8.4

Answer 2

（1）3.9x1.4÷0.35
=5.46÷0.35
=15.6
（2）0.13x102
=0.13x（100+2）
=0.13x100+0.13x2
=13+0.26
=13.26
（3）0.5x2.33x4
=（0.5x4）x2.33
=2x2.33
=4.66

（4）9.07-22.78÷34
=9.07-0.67
=8.4