a) -2/3 + 4/15 b) 1/3 – 5/4 . 4/15 c) 53/101 . -13/97 + 53/101 . -84/97 26/08/2021 Bởi Melody a) -2/3 + 4/15 b) 1/3 – 5/4 . 4/15 c) 53/101 . -13/97 + 53/101 . -84/97
Đáp án: a)-2/5 b)0 c)-53/101 Giải thích các bước giải: a) -2/3+4/15=-10/15 +4/15=-2/5 b)1/3 -5/4 . 4/15 =1/3-1/3=0 c) 53/101 .-13/97 +53/101 .-84 /97 =53/101.(-13/97-84/97) =53/101 .(-1)=-53/101 Bình luận
Đáp án: $\text{a)}$ $\dfrac{-2}{5}$ $\text{b)}$ $0$ $\text{c)}$ $\dfrac{-53}{101}$ Giải thích các bước giải: $\text{a)}$ $\dfrac{-2}{3}$ $+$ $\dfrac{4}{15}$ $=$ $\dfrac{-10}{15}$ $+$ $\dfrac{4}{15}$ $=$ $\dfrac{-6}{15}$ $=$ $\dfrac{-2}{5}$ $\text{b)}$ $\dfrac{1}{3}$ $-$ $\dfrac{5}{4}$ $.$ $\dfrac{4}{15}$ $=$ $\dfrac{1}{3}$ $-$ $\dfrac{1}{3}$ $=$ $0$ $\text{c)}$ $\dfrac{53}{101}$ $.$ $\dfrac{-13}{97}$ $+$ $\dfrac{53}{101}$ $.$ $\dfrac{-84}{97}$ $=$ $\dfrac{53}{101}$ $.$ $($$\dfrac{-13}{97}$ $+$ $\dfrac{-84}{97}$$)$ $=$ $\dfrac{53}{101}$ $.$ $\dfrac{-97}{97}$ $=$ $\dfrac{53}{101}$ $.$ $-1$ $=$ $\dfrac{-53}{101}$ Bình luận
Đáp án:
a)-2/5
b)0
c)-53/101
Giải thích các bước giải:
a) -2/3+4/15=-10/15 +4/15=-2/5
b)1/3 -5/4 . 4/15 =1/3-1/3=0
c) 53/101 .-13/97 +53/101 .-84 /97
=53/101.(-13/97-84/97)
=53/101 .(-1)=-53/101
Đáp án:
$\text{a)}$ $\dfrac{-2}{5}$
$\text{b)}$ $0$
$\text{c)}$ $\dfrac{-53}{101}$
Giải thích các bước giải:
$\text{a)}$ $\dfrac{-2}{3}$ $+$ $\dfrac{4}{15}$
$=$ $\dfrac{-10}{15}$ $+$ $\dfrac{4}{15}$
$=$ $\dfrac{-6}{15}$ $=$ $\dfrac{-2}{5}$
$\text{b)}$ $\dfrac{1}{3}$ $-$ $\dfrac{5}{4}$ $.$ $\dfrac{4}{15}$
$=$ $\dfrac{1}{3}$ $-$ $\dfrac{1}{3}$
$=$ $0$
$\text{c)}$ $\dfrac{53}{101}$ $.$ $\dfrac{-13}{97}$ $+$ $\dfrac{53}{101}$ $.$ $\dfrac{-84}{97}$
$=$ $\dfrac{53}{101}$ $.$ $($$\dfrac{-13}{97}$ $+$ $\dfrac{-84}{97}$$)$
$=$ $\dfrac{53}{101}$ $.$ $\dfrac{-97}{97}$
$=$ $\dfrac{53}{101}$ $.$ $-1$
$=$ $\dfrac{-53}{101}$