Question

解方程：12/7-x=1/2第二题：1/4+x=1/5-1/10第三题：7.28-8/15+1.75-7/15第四题：9

Answer 1

12/7-x=1/2

x=12/7-1/2;

x=24/14-7/14;

x=17/14;

1/4+x=1/5-1/10

x=1/5-1/10-1/4;

x=4/20-2/20-5/20;

x=-3/20;

7.28-8/15+1.75-7/15

=7.28+1.75-(8/15+7/15)

=9.01-1

=8.01;

9.28-（1又3分之一＋1.87）

=9.28-4/3-1.87

=7.41-4/3

=741/100-4/3

=2223/300-400/300

=1823/300;

第五题：x+5/8-7/12=1/6

x=1/6+7/12-5/8;

x=4/24+14/24-15/24

x=3/24;

x=1/8;