Решите уравнения:
Х - 2 3/4 - 1 3/4 = 4.5
X * 2.5 * (-0.4) = - 10

Х=4.5+2 34+1 34
Х=7 4020-7 21
Х=7 2/1

Х*2.5* (-0.4)=-10
х=-10:2.5:(-0.4)
х=-4:(-0.4)
х=10