3*2*1=6
____________
135
153
315
351
513
531
6 2/7 - 3 5/7 -x = 1 1/7
x= 6 2/7 - 3 5/7 - 1 1/7
x= 5 9/7 - 3 5/7 - 1 1/7
x = 1 3/7
(х-39)+65=х-39+65=х+26
(у-56)+114= у-56+114=у+58
13/14+1/15=(13*15+1*14)/210=209/210
24/25+1/4=(24*4+1*25)/100=(96+25)/100=
=121/100=1 21/100=1,21
1/2+5/7=(1*7+5*2)/14=17/14=1 3/14
1/4+5/6=(1*3+5*2)/12=13/12. =1 1/12
3/20+7/25=(3*5+7*4)/100=43/100=0,43
5/6-3/8=(5*4-3*3)/24=11/24
Решение примера72*35=2520%