首先:2.4x÷(2x-0.7)×(2x-0.7)=1.2
5.4÷3=
6.5÷0.01=
6.18÷0.6=
0.015÷0.3=
10÷0.5=
2.4×5=
0.42-0.32=
1.25×1.6=
3.4×9.75=
2.3÷0.066=
28.7-14.7+1.4
21÷3.5+21÷1.5
56.14÷3.5÷2
6.17×13.6+1.36×( )(填数使它可简便计算)
4.2x-2.6x=4.88
5(20x+1.5)=17.5