x + 32 = 90 + 45
1 + 32 + 45 +20 =
90 + 64 + 32 =
Trả lời:
1 + 32 + 45 + 20 = 98
90 + 64 + 32 = 186
Rút gọn biểu thức:
a , a + 32 + 4. − 8 + 2 b , b − 90 − 45. ( − 2 − 1 )
tính nhanh
92 + 71 + 108 , 32 x 47 + 53 x 47 + 47 x 15
90 x 143 - 43 x 90 , ( 1200 + 60 ) : 12
2 x 18 x 24 + 3 x 50 x 16 + 12 x 32 x 4
34 x 81 + 34 x 19 + 66 x 35 + 47 x 66
48 x 29 + 48 x 71 - ( 12 x 45 + 12 x 55 )
92 + 71 + 108 = (92 + 108) + 71 = 200 + 71 = 271
32 x 47 + 53 x 47 + 47 x 15 = 47(32 + 53 + 15)
= 47.100
= 4700
90 x 143 - 43 x 90 = 90.(143 - 43) = 90.100 = 9000
(1200 + 60) : 12 = 1800 : 12 = 150
2 x 18 x 24 + 3 x 50 x 16 + 12 x 32 x 4 = 18.(2.24) + 50.(3.16) + 32.(12.4) = 18.48 + 50.48 + 32.48 = 48(18 + 50 + 32) = 48.100 = 4800
92+71+108=71+(92+108)=71+200=271
90x143-43x90=90x(143-43)=90x100=9000
32x47+53x47+47x15=47x(32+53+15)=47x100=4700
(1200+60):12=1260:12=105
2x18x24+3x50x16+12x32x4=(2x24)x18+(3x16)x50+(12x4)x32
=48x18+48x50+48x32
=48x(18+50+32)
=48x100=4800
Tính nhanh:
a.650 x 32 + 349 x 32 + 32
b. 1273 x 45 - 201 x 45 - 72 x 45
a. 32 x (650 + 349 + 1 )
= 32 x 1000
= 32 000
b. 45 x ( 1273 - 201 - 72)
= 45 x 1000
= 45 000
a. 650 x 32 + 349 x 32 + 32
= (650 + 349 + 1) x 32
= 1000 x 32
= 32000.
b. 1273 x 45 - 201 x 45 - 72 x 45
= (1273 - 201 - 72) x 45
= 1000 x 45
= 45000.
Bài 1 : Tìm x biết
b) 1/2 . ( 4/5 -3/2 ) + x = 5 . (x - 1/3)
c) 2.( x-5) -3 . (x + 7) = 14
d) -8. / x -3/ = - 32
e) -90 :/ x+3/4 / = -45
b)
\(\dfrac{1}{2}\left(\dfrac{4}{5}-\dfrac{3}{2}\right)+x=5\left(x-\dfrac{1}{3}\right)\)
=> \(-\dfrac{7}{20}+x=5x-\dfrac{5}{3}\)
=> \(\dfrac{79}{60}=4x\)
=> \(\dfrac{79}{240}=x\)
Vậy \(\dfrac{79}{240}=x\)
c)
\(2\left(x-5\right)-3\left(x+7\right)=14\)
=> \(2x-10-3x-21=14\)
=> \(-x-31=14\)
=> \(-x=45\)
=> x = -45
Vậy x là -45
d)
-8 . |x - 3| = -32
=> |x - 3| = 4
=> \(\left\{{}\begin{matrix}x-3=4\\x-3=-4\end{matrix}\right.\)
=> x = 7 và x = -1
Vậy x \(\in\left\{-1;7\right\}\)
-24 phần 45 35 phần -75 -32 phần 70 -27 phần - 90
Đề gì?Rút gọn phân số à -_-
\(\frac{-24}{45}=\frac{(-24)\div3}{45\div3}\frac{-8}{15}\)
\(\frac{35}{-75}=\frac{35\div5}{(-75)\div5}=\frac{7}{-15}\)
\(\frac{-32}{70}=\frac{(-32)\div2}{70\div2}=\frac{-16}{35}\)
\(\frac{-27}{-90}=\frac{(-27)\div(-9)}{(-90)\div(-9)}=\frac{3}{10}\)
Học tốt
Tính :
45 x 32 + 45 x 23
45 : 32 + 45 : 23
43 x 33 + 43 x 22 + 43
45 x 32 + 45 x 23
= 45 x ( 32 + 23 )
= 45 x 55
= 2475
45 : 32 + 45 : 23
= 1,40625 + 1,9566521739
= 3,362771739
43 x 33 + 43 x 22 + 43
= 43 x ( 33 + 22 + 1 )
= 43 x 56
= 2408
45 x 32 + 45 x 23
= 45 x ( 32 + 23 )
= 45 x 55
= 2475
45 : 32 + 45 : 23
= 1,40625 + 1,9566521739
= 3,362771739
43 x 33 + 43 x 22 + 43
= 43 x ( 33 + 22 + 1 )
= 43 x 56
= 2408
45 x 32 + 45 x 23
= 45 x ( 32 + 23 )
= 45 x 55
= 2475
45 : 32 + 45 : 23
= 1,40625 + 1,9566521739
= 3,362771739
43 x 33 + 43 x 22 + 43
= 43 x ( 33 + 22 + 1 )
= 43
k mk nha mai đổi tk bn tk mk câu này
20 + 30 =
90 + 32 =
45 + 65 =
48 + 29 =
34 + 58 =
20 + 30 = 50
90 + 32 = 122
45 + 65 = 110
48 + 29 = 77
34 + 58 = 92
32+7=?
87+90=?
72:9=?
45:9=?
32+7=39
87+90=177
72:9=8
45:9=5
K cho mik với nhé cao nữ minh trang
32+7=39
87+90=177
72:9=8
45:9=5
k mik nha làm ơn đó
32 + 7 = 39
87 + 90 = 177
72 : 9 = 8
45 : 9 = 5