1. -7/12 + 11/20 -8/15
2. 9/11 + (-2/5 + 1/6) ÷ 11/30
3. 3/5 -2/3 + 16/15
4. -17/25 × 20/23 + -17/25 × 13/33 + -17/25 × -3/25
Giúp mk với
1. -7/12 + 11/20 -8/15 2. 9/11 + (-2/5 + 1/6) ÷ 11/30 3. 3/5 -2/3 + 16/15 4. -17/25 × 20/23 + -17/25 × 13/33 + -17/25 × -3/25 Giúp mk với
By Alaia
Đáp án:
1. $\frac{-17}{30}$
2. $\frac{2}{11}$
3. 1
4. -0,77758…
Giải thích các bước giải:
1. $\frac{-7}{12}$ + $\frac{11}{20}$ – $\frac{8}{15}$
= $\frac{-35}{60}$ + $\frac{33}{60}$ – $\frac{32}{60}$
= $\frac{-2}{60}$ – $\frac{32}{60}$
= $\frac{-34}{60}$
= $\frac{-17}{30}$.
2. $\frac{9}{11}$ + ( $\frac{-2}{5}$ + $\frac{1}{6}$ ) : $\frac{11}{30}$
= $\frac{9}{11}$ + ( $\frac{-12}{30}$ + $\frac{5}{30}$ ) : $\frac{11}{30}$
= $\frac{9}{11}$ + $\frac{-7}{30}$ : $\frac{11}{30}$
= $\frac{9}{11}$ + $\frac{-7}{11}$
= $\frac{2}{11}$.
3. $\frac{3}{5}$ – $\frac{2}{3}$ + $\frac{16}{15}$
= $\frac{9}{15}$ – $\frac{10}{15}$ + $\frac{16}{15}$
= $\frac{-1}{15}$ + $\frac{16}{15}$
= $\frac{15}{15}$
= 1.
4. $\frac{-17}{25}$ × $\frac{20}{23}$ + $\frac{-17}{25}$ × $\frac{13}{33}$ + $\frac{-17}{25}$ × $\frac{-3}{25}$
Đáp án bài 4 ra ko tròn nên bạn xem lại đề nha (hoặc tham khảo của ToTNguyetNha)
Đáp án:
1. $\frac{-7}{12}$ + $\frac{11}{20}$ – $\frac{8}{15}$
= $\frac{-7}{12}$ + $\frac{11}{20}$ + $\frac{-8}{15}$
= $\frac{-35}{60}$ + $\frac{33}{60}$ + $\frac{-32}{60}$
= $\frac{-17}{30}$
2. $\frac{2}{11}$ + ($\frac{-2}{5}$ + 1/6) : $\frac{11}{30}$
= $\frac{2}{11}$ + $\frac{-7}{30}$ : $\frac{11}{30}$
= $\frac{2}{11}$ + $\frac{-7}{11}$
= $\frac{-5}{11}$.
3. $\frac{3}{5}$ – $\frac{2}{3}$ + $\frac{16}{15}$
= $\frac{3}{5}$ + $\frac{-2}{3}$ + $\frac{16}{15}$
= $\frac{9}{15}$ + $\frac{-10}{15}$ + $\frac{16}{15}$
= 1.
4. $\frac{-17}{25}$ . $\frac{20}{23}$ + $\frac{-17}{25}$ . $\frac{13}{33}$ + $\frac{-17}{25}$ . $\frac{-3}{25}$
= $\frac{-17}{25}$ . ($\frac{20}{23}$ + $\frac{13}{33}$ + $\frac{-3}{25}$)
= $\frac{-17}{25}$ . 1,14..
= -0,77..
#_Kaiz_