1.-2×(-50)×6×12
2. 387-243-753-387-+243
3. 7,8+3 5/8-2,8-3 3/8
4.-0,2×2 3/5×(-0,5)×(- 5/13)
помогите плз))

1.72002. -12393,(7,8-2,8) +(3 5/8- 3 3/8)=5+ 2/8=5+1/4=5+0,25=5,254.(-0,2*2,6*(-0,5)*(-5/13)=26/100 * (-5/13)=-2/20=-0,1