Question

a. 1,4 + 0,(4) - 1,8(5)=?
b. 0,(5) +1,2(4)-2,7=?
c. (-8) ori (-2)-(-3)=?
d. 0,891:0,0055=?
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Answer 1

Răspuns:

a. 1,4 +(-9)=-7,6

b.4, 8-2,7=2,1

c. 16-(-3)=19

d.162

Answer 2

a) 1,4 + 0,(4) - 1,8(5) =

$1\frac{2}{5} + \frac{4}{9} - \frac{185-5}{90}$

$\frac{7}{5}+\frac{4}{9}-\frac{185-5}{90}$

$\frac{185-5}{90} =$

$=\frac{180}{90}$

$=2$

$=\frac{7}{5}+\frac{4}{9}-2$

$=-\frac{2}{1}+\frac{7}{5}+\frac{4}{9}$

$=-\frac{90}{45}+\frac{63}{45}+\frac{20}{45}$

$=\frac{-90+63+20}{45}$

$=\frac{-7}{45}$

$=-\frac{7}{45}$

b) 0,(5) +1,2(4)-2,7=

$\frac{5}{9} + \frac{124-4}{90} - 2\frac{7}{10}$

$\frac{124-4}{90}$

$=\frac{120}{90}$

$=\frac{4}{3}$

$=\frac{5}{9}+\frac{4}{3}-\frac{27}{10}$

$=\frac{50}{90}+\frac{120}{90}-\frac{243}{90}$

$=\frac{50+120-243}{90}$

$=\frac{-73}{90}$

$=-\frac{73}{90}$

c) (-8) · (-2) - (-3) =

16 + 3 = 19

d) 0,891:0,0055 = 162

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