Question

[Phạm Tâm]

Tính nhanh:

[(-30,27). 0,5 + (-9,73). 0,5] : [3,116. 0,8 - (-1,884). 0,8]

Answer 1

[Lê Thị Hồng Vân]

\(\left[\left(-30,27\right)\cdot0,5+\left(-9,73\right)\cdot0,5\right]:\left[3,116\cdot0,8-\left(-1,884\right)\cdot0,8\right]\\ =\left\{0,5\cdot\left[\left(-30,27\right)+\left(-9,73\right)\right]\right\}:\left\{0,8\cdot\left[3,116-\left(-1,884\right)\right]\right\}\\ =\left[0,5\cdot\left(-40\right)\right]:\left[0,8\cdot5\right]\\ =-20:4\\ =-5\)

Answer 2

[Trần Trọng Quân]

[(-30,27). 0,5 + (-9,73). 0,5] : [3,116. 0,8 - (-1,884). 0,8]

= [0,5.(-30,27 - 9,73)] : [0,8.(3,116 + 1,884)]

= 0,5.(-40) : 0,8.5

= -20 : 4

= -5