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)×(-...

Question

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))

Answer 1

1.7200
2. -1239
3,(7,8-2,8) +(3 5/8- 3 3/8)=5+ 2/8=5+1/4=5+0,25=5,25
4.(-0,2*2,6*(-0,5)*(-5/13)=26/100 * (-5/13)=-2/20=-0,1