cứu mk đi mn :((((((((((((

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cứu mk đi mn :((((((((((((

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  1. khanhhuyen21643
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    2024-02-05T12:33:29+00:00

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    Đáp án:

     

    Giải thích các bước giải:

     a, 1$\frac{4}{5}$ – 1,25 + 25%

    = $\frac{9}{5}$ – $\frac{5}{4}$ +$\frac{1}{4}$ 

    = $\frac{9}{5}$ – 1

    = $\frac{9-5}{5}$

    = $\frac{4}{5}$ 

    b, 4$\frac{3}{4}$ +20% -2,75 + 80%

    = $\frac{19}{4}$ + $\frac{1}{5}$ – $\frac{11}{4}$ + $\frac{4}{5}$ 

    = 2 + 1 =3

    c, 15% x $\frac{10}{9}$ + 16 : $\frac{4}{3}$ -10 x 60%

    = $\frac{3}{20}$ x $\frac{10}{9}$ +12 -6

    = $\frac{1}{6}$ + 6

    = $\frac{1+36}{6}$ 

    = $\frac{37}{6}$ 

    d, 65% : $\frac{26}{5}$ + 2,4 – 2$\frac{1}{5}$ 

    = $\frac{13}{20}$ : $\frac{26}{5}$ + $\frac{12}{5}$ – $\frac{11}{5}$ 

    = $\frac{1}{8}$ + $\frac{1}{5}$ 

    = $\frac{5 +8}{40}$ 

    = $\frac{13}{40}$ 

    e, 32% x 5 + $\frac{10}{7}$ x 42% – $\frac{1}{5}$ 

    = $\frac{8}{25}$ x 5 + $\frac{10}{7}$ x $\frac{21}{50}$ – $\frac{1}{5}$

    = $\frac{8}{5}$ + $\frac{3}{5}$ – $\frac{1}{5}$

    = 2

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