Question

Efectuați:
a)
$- \frac{1}{4} + ( - 2) \times \frac{3}{8}$
b)
$\frac{3}{4 } + -( \frac{5}{6} ) \div \frac{1}{2}$
c)
$\frac{4}{3} - \frac{4}{3 } \div \frac{1}{3}$
d)
$0.57 - 0.10 \times 0.5$
e)
$\frac{3}{4} - \frac{3}{4} \div 0.1$
f)
$\frac{2}{3} \times \frac{ - 6}{5} \times + \frac{3}{4} \times \frac{4}{ - 5}$
g)
$( - \frac{ 2}{3} - \frac{1}{2} \div 2 \frac{1}{3} + ( - 0.1)$
h)
$- 1.5 \times (2\frac{2}{3} \times (3 \frac{1}{2} - 0.5)) \div \frac{1}{2}$
dau coroana

Answer 1

a ) - 1 / 4 + ( - 2 ) × 3 / 8 = - 1 / 4 - 3 / 4 = - 4 / 4 = - 1

b)  3 / 4 - ( 5 / 6 ) × 2 = 3 / 4 - 5 / 3 = 9 / 12 - 20 / 12 = - 11 / 12

c)   4 / 3 - 4 / 3 × 3 = 4 / 3 - 12 / 3 = - 8 / 3 = - 2 intregi si 2 / 3

d)  0,57 - 0,10 × 0,5 = 0,57 - 0,05 = 0,52

e)   3 / 4 - 3 / 4  : 1 / 10 = 3 / 4 ( 1  - 10 ) = - 27 / 4 =  - 6,75

f)   2 / 3 × ( - 6 ) / 5 + 3 / 4 × 4 / ( - 5 ) = - 4 / 5 - 3 / 5 = - 7 / 5 = - 1,4

g)   2 intregi si 1 / 3 = ( 2 x 3 + 1 ) / 3 = 7 / 3

( - 2 / 3 - 1 / 2 : 7 / 3 ) + ( - 0,1 ) =

= ( - 2 / 3  - 1 / 2 × 3 / 7 =

= ( - 28 / 42 - 9 / 42 ) - 1 / 10 =

= - 37 / 42 - 1 / 10 =

= -  185 / 210 - 21 / 210 =

= - 206 / 210 =

=  - 103 / 105 =

_____________

h)   - 15 / 10 × [ 8 / 3 ×  ( 7 / 2 - 1 / 2 ) ] : 1 / 2 =

= - 3 / 2 × ( 8 / 3 × 3 ) × 2 =

= - 3  × 8 =

= - 24