Question

Evaluate the following (-31)÷[(-39)+(-1)]

Answer 1

Answer:

39 × 99 = –39 × (100–1)

= –39 ×

100–39 × -1-1 = –3900 + 39

= -3861

2) –85 × 43 + 43 × -15 = 43 × (-85) –15)

= 43 × -100

= –4300

3) 53 × –9 - (- 109) × 53 = 53 × (-9 + 109)

= 53 × 100

= 5300

4) 68 × -17 + 3 ×–68 = 68 × (-17–3)

= 68 × -20

= –1360

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Step-by-step explanation:

39 × 99 = –39 × (100–1)

= –39 ×

100–39 × -1-1 = –3900 + 39

= -3861

2) –85 × 43 + 43 × -15 = 43 × (-85) –15)

= 43 × -100

= –4300

3) 53 × –9 - (- 109) × 53 = 53 × (-9 + 109)

= 53 × 100

= 5300

4) 68 × -17 + 3 ×–68 = 68 × (-17–3)

= 68 × -20

= –1360

Read more on Brainly.in - https://brainly.in/question/683506#readmore

Answer 2

Step-by-step explanation:

$\frac{ - 31}{( - 39) + ( - 1)}$

$\frac{ - 31}{ - 39 - 1}$

$\frac{ - 31}{ - 40}$

$\frac{31}{40}$

$0.775$