Question

Помогите решить удобным способом:
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)

Answer 1

1. (-2×(-50)×(6×12)= 100×72 = 7200
2). (387 - 387) +(243-243) -753 = 0+0- 753= - 753
3) (7,8-2,8) + (3 5/8 - 3 3/8) = 5 + 2/8= 5 2/8
4) (-0,2×(-0,5))×(2 3/5×(-5/13))= 1 × (13/5×(-5/13)= -1