1)
= (6 x 25 - 13 x 7) x 2 - 8 x (7-3)^ 2
= (150 - 91) x 2 - 8 x 4^2
= 59 x 2 - 8 x 16
= 118 - 128
= -10 (Nếu bạn chưa học số âm thì nói là Không có kết quả)
Tính:
S1:(1/2-1)x(1/3-1)x(1/4-1)x..............x(1/100-1)
S2:3/22x8/32x10/42x...............x899/302
S3:55+56+...............+5100
S4:7/10x11+7/11x12+.................+7/69x70
S5:15/90x95+15/94x98+.....................+15/146x150
S6:10/56+10/140+10/28+...................+10/1400
gs mk nhé !
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
Bài 1: Tìm x , biết:
1) x - 2 = -6 12) 3 . | x - 1 | - 5 = 7
2) -5 . x - ( -3 ) = 13 13) -12 . ( x - 5 ) + 7 . ( 3 - x ) = 5
3) 15 - ( x - 7 ) = -21 14) ( x - 2 ) . ( x + 4 ) = 0
4) 3 .x + 17 = 2 15) ( x - 2 ) . ( x + 15 ) = 0
5) 45 - ( x - 9 ) = -35 16) ( 7 - x ) . ( x + 19 ) = 0
6) ( -5 ) + x = 15 17) -5 < x < 1
7) 2 . x - ( -17 ) = 15 18) | x | < 3
8) | x - 2 | = 3 19) ( x - 3 ) . ( x - 5 ) < 0
9) | x - 3 | - 7 = 13 20) 2 . x2 - 3 = 29
10) 72 - 3 . | x + 1 | = 9 21) -6 . x - ( -7) = 25
11) 17 - ( 43 - | x | ) = 45 22) 46 =- ( x - 11 ) = -48
Bài 1 Tìm số tự nhiên x biết
a) \(2^{3x+2}=4^{x+5}\)
b) \(2^x+2^x+4=272\)
c) \(\dfrac{4^5+4^5+4^5+4^5}{3^5+3^5+3^5}=\dfrac{6^5+6^5+6^5+6^5+6^5+6^5}{2^5+2^5}=2^x\)
d) \(2\cdot2^2+3\cdot2^2+4\cdot2^2+5\cdot2^2+...+x\cdot2^x=2^{x+10}\)
tìm x
\([\dfrac{6:\dfrac{3}{5}-1\dfrac{1}{16}.\dfrac{16}{7}}{4\dfrac{1}{5}-\dfrac{10}{11}+5\dfrac{2}{11}}-\dfrac{\left(\dfrac{3}{20}+\dfrac{1}{2}-\dfrac{1}{5}\right).\dfrac{12}{49}}{3\dfrac{1}{3}+\dfrac{2}{9}}].x=2\dfrac{23}{96}\)
Đề bài: Tìm x, biết:
a) 390 - ( x - 7) = 13 mũ 2 : 12
b) ( x - 35 . 2 mũ 2) : 7= 3 mũ 3 - 24
c) x - 6 : 2 - ( 4 mũ 2 . 3 - 24) : 2 : 6 = 3
d) 4 . x - 5 = 5 + 5 mũ 2 +5 mũ 3 + ..... + 5 mũ 99
e) ( 2 . x - 1 ) mũ 4 = 625
1. Tính ( Phân số )
1) -5/24+16/27+0,75
2)-4/12+6/7+8/24
3)9/18+-7/12+-16/-32
4)5/-8+14/25+-6/10
2. Tìm x , biết :
1) 1/3 + 1/33 < x/210 < -4/-7 + 3/5 + -2/3 (x thuộc Z )
2) 5/3 + -14/3 < x < 1/5 +18/10 ( x thuộc Z )
thực hiện phép tính
a, (-3/4+ 5/6): (2/9 - 7/12)
Tìm x, biết:
a, 1,5+ 1/1/4 x= 2/3
b, (2,7 x - 1/1/2 x) : 2/7= -21/4
c, 5/8 +1/3: x = 1/2
d, -5/6+ 8/3 + -29/6 < x < -1/2+ 2+ 5/2 ( với x thuộc Z)
Tìm số x , biết
a) \(\dfrac{2}{3}x-\dfrac{3}{2}x=\dfrac{5}{12}\)
b) \(\dfrac{2}{5}+\dfrac{3}{5}.\left(3x-3,7\right)=-\dfrac{53}{10}\)
c) \(\dfrac{7}{9}:\left(2+\dfrac{3}{4}x\right)+\dfrac{5}{9}=\dfrac{23}{27}\)
d) \(\dfrac{-2}{3}.x+\dfrac{1}{5}=\dfrac{3}{10}\)
e) \(\left|x\right|-\dfrac{3}{4}=\dfrac{5}{3}\)
f) \(\left|2x-\dfrac{1}{3}\right|+\dfrac{5}{6}=1\)