(800x-1345)/1345 = 30%
800x-1345 =3/10*1345
800x-1345=4035/10
800x=17485/10
x=2.185625
①2乘x减1的差等于3/2x加1 ②800x减1345的差除以1345等于百分之30 ③x+2/3+x等于56 这三个方
(800x-1345)/1345 = 30%
800x-1345 =3/10*1345
800x-1345=4035/10
800x=17485/10
x=2.185625