8.75 + (-13.25)
8.75 - 13.25 = -4.5
1,05+0,580431*0,4-0,05-0,580331*0,4=
<span>1+0,4*(0,580431-0,580331)=1+0,4*0,001=1+0,00004=1,00004</span>
8х + 4 • ( 13х + 32 ) = 308
8х + 52х + 128 = 308
60х = 308 - 128
Х = 180 : 60
Х = 3
27х=1863
х=1863:27
х=69
проверка :
27×69=1863