357-(у-281)+112=402
357-у+281+112=402
-у=402-750
-у=-348
у=348
Площадь круга = "пи" R^2 = 3.14 * 15^2 = 3.14 * 225 = 706,5 cм2
35) 5x - 3 + 7x - 4 = 8 - 15 + 11x; 5x + 7x - 11x = 8 - 15 + 3 + 4; x = -4.
37) 7 - 5x - 8 + 4x + 5x + 6 = 8; - 5x + 4x + 5x = 8 - 7 + 8 - 6; 4x = 3; x = 0,75.
39) 4(3x - 5) = x + 3; 12x - 20 = x + 3; 12x - x = 3 + 20; 11x = 23; x = 2(1/11).
40) 2 - x = 3x - 9; -x - 3x = -9 - 2; -4x = -11; x = 2,75
102-98:100*25:10=5
180:18*23-230+50=50
12*10+180:3*6=600
16*3+2:5*10=100
65072 / 14 + 16380 /5 +94 = 4648 + 3276 + 94 = 8018
67184 / 19 + 62776 /4 -38 = 3536 + 15694 -38 = 19192
20520 /15 + 42172 / 8 - 6 = 1368 + 5271,5 - 6 = 6633,5
54144 /18 + 24696 /7 + 24 = 3008 + 3528 + 24 = 6560