7.5х-2.46х=78.3+124.56
5.04х=202.86
х=202.86:5.04
х=40.25
A) (3-4,72)*(-5,12-4,38)+3,25*(-7,4)= в) (0,34-2,59)*7,8+2,9*(4,31-0,79)=
Lessthanperfect [213]
(3-4,72)*(-5,12-4,38)+3,25*(-7,4)=7,71
1) 3 - 4,72= -1,72
2) -5,12 - 4,38 = -9,5
3) - 1,72 * (-9,5) = 16,34
4) 3,25 * (-7,4) = - 24,05
5) 16,34 - 24,05 = 7,71
<span>
(0,34-2,59)*7,8+2,9*(4,31-0,79)= - 7,342
1) </span>0,34-2,59 = - 2,25
2) -2,25 * 7,8 = - 17,55
3) 4,31-0,79 = 3,52
4) 2,9 * 3,52 = 10,208
5) - 17,55 + 10,208 = -7, 342
1.3*9=24
24=24
2.10*6=60
60>16
3.10*8=80
80>18
4.9*10=90
19<90