Tính d ) 7 15 : 5
Kết quả của phép tính -7/15 . 5/8 . 15/-7 . (-16) bằng
A.7/5 B.-10 C.5/8 D.15/-7
Tính:
a, 7×5 + 15
b, 6×5 + 31
c, 22 + 7×4
d, 7×9 + 17
a, 7×5 + 15 = 35 + 15 = 50
b, 6×5 + 31 = 30 + 31 = 61
c, 22 + 7×4 = 22 + 28 = 50
d, 7×9 + 17 = 63 + 17 = 80
Bài 1 : Thực hiện phép tính
a) 3/5 + -7/4 b) 4/5 : -8/15 c) 7 và 5/9 - ( 2 và 3/4 + 3 và 5/9 )
d) 4/19 . -3/7 + -3/7 . 15/19 + 5/7
a: \(\dfrac{3}{5}-\dfrac{7}{4}=\dfrac{12}{20}-\dfrac{35}{20}=\dfrac{-23}{20}\)
b: \(\dfrac{4}{5}:\dfrac{-8}{15}=\dfrac{-4}{5}\cdot\dfrac{15}{8}=\dfrac{-60}{40}=\dfrac{-3}{2}\)
c: \(=7+\dfrac{5}{9}-2-\dfrac{3}{4}-3-\dfrac{5}{9}=2-\dfrac{3}{4}=\dfrac{5}{4}\)
d: \(=\dfrac{-3}{7}\left(\dfrac{4}{19}+\dfrac{15}{19}\right)+\dfrac{5}{7}=\dfrac{2}{7}\)
1.Tính
a. 6/11 + 7/5
b. 9/5 - 6/7
c. 11/2 -3
d. 15+ 1/3
2. Tính
a. 3/7 * 7/2
b. 6 * 7/9
c. 8/15 * 5
d. 6/13 * 26/2
1. a) \(\frac{6}{11}+\frac{7}{5}=\frac{30}{55}+\frac{77}{55}=\frac{30+77}{55}=\frac{107}{55}\)
b) \(\frac{9}{5}-\frac{6}{7}=\frac{63}{35}-\frac{30}{35}=\frac{63-30}{35}=\frac{33}{35}\)
c) \(\frac{11}{2}-3=\frac{11}{2}-\frac{3}{1}=\frac{11}{2}-\frac{6}{2}=\frac{11-6}{2}=\frac{5}{2}\)
d) \(15+\frac{1}{3}=\frac{15}{1}+\frac{1}{3}=\frac{45}{3}+\frac{1}{3}=\frac{45+1}{3}=\frac{46}{3}\)
2. a)\(\frac{3}{7}\cdot\frac{7}{2}=\frac{21}{14}\)
b) \(6\cdot\frac{7}{9}=\frac{42}{9}\)
c) \(\frac{8}{15}\cdot5=\frac{40}{15}\)
d) \(\frac{6}{13}\cdot\frac{26}{2}=\frac{156}{26}\)
Dấu chấm mấy bài trên thay thế cho dấu nhân nhá..
Thực hiện phép tính ( tính nhanh nếu có thể)
c) 16 2/7: -3/5 + 28 2/7 : 3/5
d) 3/5 : (-1/15 -1/6) + 3/5 : ( -1/3 - 1 1/15)
1.tính A.-5/8-7/-12 B.3/4+(-5)/6-11/-12 C.1/6-1/36 D.15/48-(-5)/12 E.-1/7-1/8 F.-5/15-(-3)/25 G.3/4-(-5)/12-7/-24
a: \(=\dfrac{-5}{8}+\dfrac{7}{12}=\dfrac{-15}{24}+\dfrac{14}{24}=\dfrac{-1}{24}\)
b: \(=\dfrac{3}{4}-\dfrac{5}{6}+\dfrac{11}{12}=\dfrac{9}{12}-\dfrac{10}{12}+\dfrac{11}{12}=\dfrac{10}{12}=\dfrac{5}{6}\)
c: \(=\dfrac{6}{36}-\dfrac{1}{36}=\dfrac{5}{36}\)
d: \(=\dfrac{5}{12}+\dfrac{5}{12}=\dfrac{10}{12}=\dfrac{5}{6}\)
e: \(=\dfrac{-8}{56}-\dfrac{7}{56}=\dfrac{-15}{56}\)
f: \(=\dfrac{-5}{15}+\dfrac{3}{25}=\dfrac{-25}{75}+\dfrac{9}{75}=\dfrac{-16}{75}\)
(2 điểm) Tính
a) 5 x 5 + 18
b) 5 x 7 + 23
c) 7 x 7 x 2
d) 15 – 6 x 2
a) 5 x 5 + 18
= 25 + 18
= 43
b) 5 x 7 + 23
= 35 + 23
= 58
c) 7 x 7 x 2
= 49 x 2
= 98
d) 15 – 6 x 2
= 15 – 12
= 3
Bài 1: Tính :
a) 2/5 + 7/10 = ……………………………………………….......................... b) 6/7 - 5/8 = …………………………………………………………………… c) 3/5 x 15/8 =…………………………………………………………............ d) 1/4 : 3/7 =……………………………………………………………..............a]11/10
b]13/56
c]9/8
d]7/12
tick cho mình nha
a,2/5+7/10=11/10 b,6/7-5/8=13/56 c,3/5 x 15/8=9/8 d,1/4:3/7=7/12 HT
1. Tính
a, 11/15 + - 7/10 + 13/30
b, 7/9 + -1/4 + 3/5
c, -5/21 + -5/14 + 4/35
d, 2/7 + 1/9 + 1/7 + 5/9 + 8/14
e, -4/9 + 8/15 + -2/11 + 5/-9 + 7/15
Tính bằng cách thuận tiện nhất
A. 3/5 * 6/7 + 3/5 : 7 + 6/5
B. 29/12 : 1/2 - 5/12 : 1/2 - 1/2
C. 2/15 * 4/7 + 4/7 * 2/3 + 4/7 : 5
D. 14/15 * 15/16 * 16/17 : 14/51
\(\frac{3}{5}\times\frac{6}{7}+\frac{3}{5}:7+\frac{6}{5}\)
\(=\frac{3}{5}\times\frac{6}{7}+\frac{3}{5}\times\frac{1}{7}+\frac{6}{5}\)
\(=\frac{3}{5}\times\left(\frac{6}{7}+\frac{1}{7}\right)+\frac{6}{5}\)
\(=\frac{3}{5}\times1+\frac{6}{5}\)
\(=\frac{3}{5}+\frac{6}{5}=\frac{9}{5}\)
~ Hok tốt ~
\(\frac{29}{12}:\frac{1}{2}-\frac{5}{12}:\frac{1}{2}-\frac{1}{2}\)
\(=\left(\frac{29}{12}-\frac{5}{12}\right):\frac{1}{2}-\frac{1}{2}\)
\(=2:\frac{1}{2}-\frac{1}{2}\)
\(=4-\frac{1}{2}=\frac{7}{2}\)
~ Hok tốt ~
\(\frac{2}{15}\times\frac{4}{7}+\frac{4}{7}\times\frac{2}{3}+\frac{4}{7}:5\)
\(=\frac{2}{15}\times\frac{4}{7}+\frac{4}{7}\times\frac{2}{3}+\frac{4}{7}\times\frac{1}{5}\)
\(=\left(\frac{2}{15}+\frac{2}{3}+\frac{1}{5}\right)\times\frac{4}{7}\)
\(=1\times\frac{4}{7}=\frac{4}{7}\)
~ Hok tốt ~