<span>225:(х-1)+130:26=30
225:(х-1)+5=30
225:(х-1)=30-5
225:(х-1)=25
25*(х-1)=225
25х-25=225
25х=225+25
25х=250
х=250:25
х=10</span>
Г) 145% от 70 тонн = 70 * 1,45 = 101,5
д) 12,7% от 80 ц = 80 * 0,127 = 10,16
3/16 * 1 1/5 : (7 1/2 * 1/10 - 3/5) - 3 1/2 : 4 = 5/8
1) 7 1/2 * 1/10 = 15/2 * 1/10 = (3*1)(2*2) = 3/4
2) 3/4 - 3/5 = 15/20 - 12/20 = 3/20
3) 1 1/5 : 3/20 = 6/5 * 20/3 = (2*4)/(1*1) = 8
4) 3/16 * 8 = 3/2 = 1 целая 1/2
5) 3 1/2 : 4 = 7/2 * 1/4 = 7/8
6) 1 1/2 - 7/8 = 1 4/8 - 7/8 = 12/8 - 7/8 = 5/8
А) (-2.5+3)-(2.5+9)(-2.5+9)=-6.25+9-(2.5+9)(-2.5+9)=2.75-(11×6.5)=71.5-2.75=68.75
(-5 целых4/3+4целых2/3)+20=-1целая2/3+20=-1целая2/3+19целых3/3=18целых1/3