Question

Rezolvati urmatoarele exercitii:
a) 3/2 +5:( 12/5+ 0,(8) )
b)4:(8,7 - 1,38) ²

Answer 1

Raspuns:

Explicație pas cu pas:

a)3/2+5:(12/5+0,(8))=3/2+5;(12/5+8/9)=3/2+5÷148/45=3/2+5×45/148=3/2+225/148=447/148

b)4:(8,7-1,38)^2=4:7,32^2=4:(183/25)^2=4:33489/625=4×625/33489=2500/33489

Answer 2

Salut!

a)

$\dfrac{3}{2} + 5 \div ( \dfrac{12}{5} + 0.(8)) = \\ \\ \\ \dfrac{3}{2} + \dfrac{5}{1} \div ( ^{9)} \dfrac{12}{5} + ^{5)} \dfrac{8}{9} ) = \\ \\ \\ \dfrac{3}{2} + \dfrac{5}{1} \div ( \dfrac{108}{45} + \dfrac{40}{45} ) = \\ \\ \\ \dfrac{3}{2} + \dfrac{5}{1} \div \dfrac{148}{45} = \\ \\ \\ \dfrac{3}{2} + \dfrac{5}{1} \times \dfrac{45}{148} = \\ \\ \\ ^{74)} \dfrac{3}{2} + \dfrac{225}{148} = \\ \\ \\ \dfrac{222}{148} + \dfrac{ 225 }{148} = \dfrac{447}{148}$

b)

$4 \div (8.7 - 1.38)^{2} = \\ \\ \\ 4 \div (7.32)^{2} = \\ \\ \\ 4 \div ( \frac{732}{100} ) ^{2} = \\ \\ \\ \dfrac{4}{1} \div \dfrac{535824}{10000} ^{(16} = \\ \\ \\ \dfrac{4}{1} \div \dfrac{33489}{625 } = \\ \\ \\ \dfrac{4}{1} \times \dfrac{625}{33489} = \dfrac{2500}{33489}$