Tính
25/7 - 2 + 3/2
4/5 x 10/3 : 8
7/3 + 2/5 : 1/6
25/7 - 2 + 3/2
4/5 x 10/3 : 8
7/3 + 2/5 : 1/6
GHI CẢ PHÉP TÍNH!!!
lm cx trong tối hôm mùng 8/4/2023^^
nếu các bạn trả lời phép tính của mình thì mong các vạn ghi tất cả các bước làm và phép tính ra ạ ><
`25/7 - 2 +3/2`
`= 25/7 - 14/7 +3/2`
`= 11/7 +3/2`
`= 22/14 + 21/14`
`= 43/14`
__
`4/5 xx 10/3 : 8`
`= 4/5 xx 10/3 xx 1/8`
`= 40/15 xx 1/8`
`= 8/3 xx 1/8`
`= 8/24`
`=1/3`
__
`7/3 + 2/5 :1/6`
`= 7/3 +2/5 xx 6`
`= 7/3 + 12/5`
`= 35/15 + 36/15`
`= 71/15`
`25/7 - 2 + 3/2= (25/7+ 3/2) - 2 = 71/14 - 2 = 43/14 `
`4/5 xx 10/3 : 8=(4/5 xx 10/3) xx 1/8 = 8/3 xx 1/8 = 1/3 `
`7/3 + 2/5 : 1/6 = 7/3 + 2/5 xx 6/1 = 7/3 +( 2/5 xx 6/1 ) = 7/3 +12/5 = 71/15`
xin cho hỏi bài tính nhanh 6 mà kiểu 87 + 24 = 24-13) 87+13 để ra số tròn chục á nah tôi cần đáp của vài bài sau:
a)3 mũ 2 x 5 + 2 mũ 3 x 10 - 81 : 3
b)20 : 2 mũ 2 +5 mũ 9: 5 mũ 8
c)100 : 5 mũ 2 +7 x 3 mũ 2
d) 5 mũ 13 ; 5 mũ 10 -25 x 2 mũ 2
e) 84 : 4 + 3 mũ 9 : 3 mũ 7 + 5 mũ 0
f)( 5 mũ 19 : 5 mũ 17 +3) : 7
g)1200 : 2 + 6 mũ 2 x 2 mũ 1 + 18
h)5 mũ 9 : 5 mũ 7 + 70 : 14 - 20.
tính nhanh:
a) 1/2*2/3 ; 5/6*6/7 ; 10/15*15/20 ;24/25*25/36
b)1/2*2/3*3/4*4/5*5/6*6/7*7/8*8/9*9/10
b)1/2*2/3*3/4*4/5*5/6*6/7*7/8*8/9*9/10
=1x2x3x4x5x6x7x8x9
2x3x4x5x6x7x8x9x10
= 1
10
1. Tính nhanh
a) A=1/ 5 .6 + 1/ 6 .7 + 1/ 7. 8+ ... + 1/24 . 25
b) B= 2/ 3 .5 + 11/ 8 .19 + 13/ 19 .32 + 25/ 32 . 57 + 30/ 57 . 87
a, A= 1/5.6+1/6.7+1/7.8+...+1/24.25
=1/5-1/6+1/6-1/7+1/7-1/8+...+1/24-1/25
=1/5-1/25
=4/25
hok tốt k nha
(/ là phần, * là cộng)
Tính nhanh:
A= 1/2 + 1/6 + 1/12 + 1/20 + 1/30 + 1/42 + 1/56 + 1/72
B= 1/5*6 + 1/6*7 + 1/7*8 +........+ 1/24*25
C= 2/3*5 + 3/5*8 + 11/8*19 + 13/19*32 + 25/32*57 + 30/57*87
A = 1/2 + 1/6 + 1/12 + 1/20 + 1/30 + 1/42 + 1/56 + 1/72
= 1/1.2 + 1/2.3 + 1/3.4 + 1/4.5 + 1/5.6 + 1/6.7 + 1/7.8 + 1/8.9
= 1- 1/2 + 1/2 - 1/3 + 1/3 - 1/4 + 1/4 - 1/5 + 1/5 - 1/6 + 1/6 - 1/7 + 1/7 - 1/8 + 1/8 - 1/9
= 1 - 1/9 = 8/9
Câu B, C dấu * là nhân hay công vậy?
Tính nhanh
( 24 x 5 - 12 x 10) x ( 1+2+3+4+5+6+7+8+9)
30 x 25 x 7 x 8/ 75 x 8 x 12 x 14
\((\)125-120\()\)x45
5x45=225
\(\dfrac{30x25x7x8}{75x8x12x14}\)=\(\dfrac{10\cdot1\cdot7\cdot1}{1\cdot1\cdot1\cdot12\cdot2}\)=\(\dfrac{70}{24}\)
Thực hiện phép tính(tính hợp lí nếu có thể)
4/5+(-5)/4 -1/3+2/5-5/6 2/3-5/7.14/25 (2/5-5/6):8/15-(-1)^2
-3/13+(-7)/17+(-5)/19+(-10)/13+24/17+(-14)/19
\(\dfrac{4}{5}\)+\(\dfrac{-5}{4}\)=\(\dfrac{0}{4}\)
\(\dfrac{-1}{3}\)+\(\dfrac{2}{5}-\dfrac{5}{6}\)=\(\dfrac{-10}{30}+\dfrac{12}{30}-\dfrac{25}{30}\)=\(\dfrac{-23}{30}\)
\(\dfrac{2}{3}-\dfrac{5}{7}.\dfrac{14}{25}\)=\(\dfrac{2}{3}-\dfrac{2}{5}\)=\(\dfrac{10}{15}-\dfrac{6}{15}\)=\(\dfrac{4}{15}\)
a: \(=\dfrac{16-25}{20}=\dfrac{-9}{20}\)
b: \(=\dfrac{-10}{30}+\dfrac{12}{30}-\dfrac{25}{30}=-\dfrac{23}{30}\)
c: \(=\dfrac{2}{3}-\dfrac{1}{5}\cdot2=\dfrac{2}{3}-\dfrac{2}{5}=\dfrac{10-6}{15}=\dfrac{4}{15}\)
d: \(=\dfrac{12-25}{30}\cdot\dfrac{15}{8}-1=\dfrac{-13}{16}-1=\dfrac{-29}{16}\)
e: \(=\dfrac{-3}{13}-\dfrac{10}{13}-\dfrac{7}{17}+\dfrac{24}{17}-\dfrac{5}{19}-\dfrac{14}{19}=-1\)
1. Tính nhanh
a) A=1/ 5 .6 + 1/ 6 .7 + 1/ 7. 8+ ... + 1/24 . 25
b) B= 2/ 3 .5 + 11/ 8 .19 + 13/ 19 .32 + 25/ 32 . 57 + 30/ 57 . 87
a: \(A=\dfrac{1}{5}-\dfrac{1}{6}+\dfrac{1}{6}-\dfrac{1}{7}+...+\dfrac{1}{24}-\dfrac{1}{25}\)
\(=\dfrac{1}{5}-\dfrac{1}{25}=\dfrac{4}{25}\)
b: \(B=\dfrac{1}{3}-\dfrac{1}{5}+\dfrac{1}{8}-\dfrac{1}{19}+\dfrac{1}{19}-\dfrac{1}{32}+\dfrac{1}{32}-\dfrac{1}{57}+\dfrac{1}{57}-\dfrac{1}{87}\)
\(=\dfrac{2}{15}+\dfrac{1}{8}-\dfrac{1}{87}\)
=859/3480
Tính:
a) (135-35).(-37)+37.(-42-58)
b) -65.(87-17)-87.(17-65)
c) [3.(-2)-(-8)].(-7)-(-2).(-5)
d) 25.(32+47)-32.(25+47)
e) [3.(-2)-(-8)].(-7)-(-2).(-5)+(-1)^10
a) (135 - 35) . (-37) + 37 . (-42 - 58)
= 100 . 0 . (-100)
= 0
b) -65 . (87 - 17) - 87 . (17 - 65)
= -65 . 70 - 87 . (-48)
= -4550 - 135
= -4415