\(0,75-0,6+\dfrac{3}{7}+\dfrac{3}{13}-2,75-2,2+\dfrac{11}{7}+\dfrac{11}{13}\\ =\left(0,75-0,6-2,75-2,2\right)+3\cdot\left(\dfrac{1}{7}+\dfrac{1}{13}\right)+11\cdot\left(\dfrac{1}{7}+\dfrac{1}{13}\right)\\ =\left(-4,8\right)+\left(3+11\right)\cdot\dfrac{20}{91}\\ =-4,8+14\cdot\dfrac{20}{91}\\ =-\dfrac{24}{5}+\dfrac{40}{13}\\ =-\dfrac{112}{65}\)
Tính nhanh giá trị của biểu thức
P =\(\dfrac{0,75-0,6+\dfrac{3}{7}+\dfrac{3}{13}}{2,75-2,2+\dfrac{11}{7}+\dfrac{11}{3}}=\dfrac{\dfrac{3}{4}-\dfrac{3}{5}+\dfrac{3}{7}+\dfrac{3}{13}}{\dfrac{11}{4}-\dfrac{11}{5}+\dfrac{11}{7}+\dfrac{11}{13}}\)
TÍNH HỢP LÝ :
1) \(\dfrac{-8}{11}.\left(\dfrac{33}{22}+\dfrac{3333}{2020}+\dfrac{333333}{303030}\right)\)
2) \(\dfrac{0,4+\dfrac{2}{7}-\dfrac{2}{11}}{0,6+\dfrac{3}{7}-\dfrac{3}{11}}+\dfrac{0,25-0,2+\dfrac{1}{7}}{0,75-0,6+\dfrac{3}{7}}\)
1)tính:
a) 3/4 - 3/5 + 3/7 + 3/11
____________________
13/5 -13/5 + 13/7 + 13/11
b) 3/11 . 4/15 + 19/15 . -3/11
1. Tính hợp lí
a, 6/7 . 5/11 + 5/7 . 2/11 - 5/7 . 14/ 11
b, 1/3 . 4/5 + 1/3 . 6/5 - 1/3
( Hỗn số )
c, 11/3/13 - (2/4/7 + 5/3/13)
d, 2/7 . 5/1/4 - 2/7 . 3/1/4
e, 75 . (-4/24 + 7/1/15 - 5/7/15)
Giải hộ mình với ạ!
Tính
1. 6/5 - 1/4 + 4/5 - 3/4
2. 7/9 - 5/12 + 2/9 - 7/12
3. -4/15 + 5/13 - 11/15 + 8/13
4. 9/15 - 7/13 +6/15 - 6/13
5. 12/5 - 3/7 + 3/5 - 4/7
6. 6/5 - 1/4 + 4/5 - 3/4 + 1/2
7. 13/7 - 8/6 + 8/7 - 4/6 - 1/3
a) 2/3 -4 . (1/2 +3/4)
b) (-1/3 + 5/6) .11 7
c) -5/11 . 7/15 . 11/-5 . (-30)
d) -1/6 . -15/19 . 38/45
e) -5/9 . 3/11 + ( -13/18 . 3/11)
f) ( 2 2/15 . 9/17 . 3/32) : -3/17
a) 2/3 -4 . (1/2 +3/4)
b) (-1/3 + 5/6) .11 -7
c) -5/11 . 7/15 . 11/-5 . (-30)
d) -1/6 . -15/19 . 38/45
e) -5/9 . 3/11 + ( -13/18 . 3/11)
f) ( 2 2/15 . 9/17 . 3/32) : -3/17
12+ 3/11-6/13+3.25-5+3/11-4+7/12+√1+9/16
chỗ 12+3/11;5+3/11;4+7/12;1+9/16 là hỗn số nhé!
3.a: -3/2-2x+3/4=-4
b: (-2/3.x-3/5).(3/-2-10/3)=2/5
c: x/2-(3x/5-13/5)=-(7/5+7/10x)
d: (3/2-5/11-3/13).(2x-2)=(-3/4+5/22+3/26)
e: 2/3x-3/12=4/5-(7/x-2)
