98:(5+x)-36:4=23
98:(5+x)-9 =23
98:(5+x) =23+9
98:(5+x) =32
(5+x) =98:32
(5+x) =49/16
x =49/16-5
=> x=-31/16
Đúng k nhỉ
98:(5+x)-36:4=23
98:(5+x)-9=23
98:(5+x) =23+9
98:(5+x) =32
5+x =98:32
5+x =49/16
x =-31/16
tich nha
98:(5+x)-36:4=23
98:(5+x)-9 =23
98:(5+x) =23+9
98:(5+x) =32
(5+x) =98:32
(5+x) =49/16
x =49/16-5
=> x=-31/16
Đúng k nhỉ
98:(5+x)-36:4=23
98:(5+x)-9=23
98:(5+x) =23+9
98:(5+x) =32
5+x =98:32
5+x =49/16
x =-31/16
tich nha
Bài 1: Tính một cách hợp lí:
1) 2155 - ( 174 + 2155 ) + ( -68 + 174 ) 7) -1911 - ( 1234 - 1911 )
2) -25 . 72 + 25 . 21 - 49 . 25 8) 156 . 72 + 28 . 156
3) 35 . ( 14 - 23 ) - 23 . ( 14 - 35 ) 9) 32. ( -39 ) + 16 . ( -22 )
4) 8154 - ( 674 + 8154 ) + ( -98 + 674 ) 10) -1945 - ( 567 - 1945 )
5) -25 . 21 + 25 . 72 + 49 . 25 11) 184 . 33 + 67 . 184
6) 27 . ( 13 - 16 ) - 16 . ( 13 - 27) 12) 44 . ( -36 ) + 22 . ( -28 )
1.Tính nhanh
a.(1/9 : 8/27 ) : 16/48 : 8/21
b.19/23 + 1/9 x 36/23
c.(13/23 + 1313/2323 - 131313/232323 ) x ( 1/3 + 1/4 - 7/12 )
Bài 1: Tìm x, biết:
a, 2/1/4x - 9/1/4 = |-20|
b, 1/2x + 2/3. ( x-2) =1/3
c, x- 25% = 6/11. (1/2+ 3/4 - 1/3)
d, - (-23) + (-36) - |-57| + (-29) .2
e, x/30 = 3/10 + -1/15
f, (x - 1/4) : 4/5 = 15/16
g, 1/3/5- 7/12 :x - -9/4
h, (2/4/5. x +50 ). 2/3 = -51
1. Tính nhanh
(-48) . 72 +36 . (-340)
2. Tìm x
a) 11 . x = -55
b) -3 .x = -12
c) 3x - 12 = -48
d) 10 + 23 . (2x - 10) = -36
e) -12 . (x-5) +7 (3 - x) = 5
f) | 2x - 1 | + 3 =8
g) | 2x2 - 3 | -4 = 11
Help me !!!
Tính giá trị biểu thức:
A= 100+98+96+...+2-99-97-95-...-1
B=1+7+8+15+23+...+160
C=1+4+5+9+14+...+60+97
Tính bằng cách hợp lí nhất:
36 x 23 + 62 x 23 + 46
Giups mik nhes!
bài 1 : so sánh :
a) \(\dfrac{23}{21}\)và\(\dfrac{21}{23}\)
b)\(\dfrac{19}{26}\)và \(\dfrac{21}{25}\)
bài 2 : sắp sếp các phân số sau từ bé đến lớn :
a)\(\dfrac{7}{36};\dfrac{24}{36};\dfrac{13}{36};\dfrac{1}{36};\dfrac{43}{36};\dfrac{36}{36}\)
b)\(\dfrac{-3}{10};\dfrac{-31}{100};\dfrac{-297}{1000};\dfrac{10000}{-3056}\)
c)\(\dfrac{13}{20};\dfrac{7}{20};\dfrac{9}{4};\dfrac{2}{5};\dfrac{1}{2}\)
d)\(\dfrac{13}{21};\dfrac{152}{17};\dfrac{13}{17};\dfrac{-5}{21}\)
e)\(\dfrac{-1}{2};\dfrac{3}{-4};\dfrac{-2}{3};\dfrac{4}{-5}\)
tìm x
-9/ 46 - 4 1/23 : ( 3 1/4 - x: 3/5 )+ 2 8/23 = 1
Tính
x - 2 / 99 + x - 3 / 98 = x - 4 / 97 + x - 5 / 96