Bài 1:Tìm x
a,(3.x-2^4).7^3=2.7^4
b,x-[ 42+(-28)] = -8
c,4-(7.x)=x-(13-4)
Bài 2:Tính nhanh
a,58.75+58.50-58.25
b,27.39+27.63-2.27
c,48.13+48.115+134.52
d,27.121-87.27+73.34
Bài 1: Tính giá trị của biểu thức sau:
a) 2763 + 152 b) (-7) + (-14) c) (-35) + (-9)
d) (-5) + (-248) e) (-23) + 105 f) 78 + (-123)
g) 23 + (-13) h) (-23) + 13 i) 26 + (-6)
k) 19 + (23 – 33) m) (-12 – 44) + (-3) n) 4 – (-15)
o) 99 – [109 + (-9)] p) (-75) + 50
q (-75) + (-50) r) (-23) + 13 + ( - 17) + 57
s) 14 + 6 + (-9) + (-14)
Bài 2: Tính nhanh:
a) 58.75 + 58.50 – 58.25 b) 27.39 + 27.63 – 2.27
c) 128.46 + 128.32 + 128.22 d) 66.25 + 5.66 + 66.14 + 33.66
e) 12.35 + 35.182 – 35.94 g) 27.121 – 87.27 + 73.34
h) 125.98 – 125.46 – 52.25 i) 136.23 + 136.17 – 40.36
Bài 3: Tìm số nguyên x, biết:
a) x - 7 = -5 b) 128 - 3 . ( x+4) = 23
c) [ (6x - 39) : 7 ] . 4 = 12 d)( x: 3 - 4) . 5 = 15
Bài 4: Tìm tổng của tất cả các số nguyên thỏa mãn:
a) -4 < x < 3 b) -5 < x < 5
c) -10 < x < 6 d) -1 ≤ x ≤ 4
e) -6 < x ≤ 4 f) -4 < x < 4
Tính nhanh:
A) 58.75+58.50-58.25
B) 27.39+27.63-2.27
C) 128.46+128.32+128.22
D) 12.35+35.182-35.94
E) 48.19+48.115+134.52
F) 136.23+136.17-40.36
G) 17.93+116.83+17.23
H) 19.27+47.81+19.20
I) 87.23+13.93+70.87
Áp dụng công thức này là được :
m.a+m.b+m.c = m(a+b+c)
a) 58.75 + 58.50 - 58.25
= 58. (75 + 50 - 25)
= 58. 100
= 5800
b) 27.39 + 27.63 + 2.27
= 27. (39 + 63 - 2)
= 27. 100
= 2700
c) 128.46 + 128.32 + 128.22
= 128.(46 + 32 + 22)
= 128. 100
= 12800
d) 12.35 + 35.182 - 35.94
= 35.(12 + 182 - 94)
= 35. 100
= 3500
e) 48.19 + 48.115 + 134.52
= 48.(19 + 115) + 134.52
= 48.134 + 134.52
= 134.(48 + 52)
= 134.100
= 13400
f) 136.23 + 136.17 - 40.36
= 136.(23 + 17) - 40.36
= 136.40 - 40.36
= 40.(136 - 36)
= 40.100
= 4000
g) 17.93 + 116.83 + 17.23
= 17.(93 + 23) + 116.83
= 17.116 + 116.83
= 116.(17 + 83)
= 116.100
= 11600
h) 19.27 + 47.81 + 19.20
= 19.(27 + 20) + 47.81
= 19.47 + 47.81
= 47.(19 + 81)
= 47.100
= 4700
i) 87.23 + 13.93 + 70.87
= 87.(23 + 70) + 13.93
= 87.93 + 13.93
= 93.(87 + 13)
= 93.100
= 9300
#NgHn
bài 1 : tính nhanh
48.19+48.115+134.52
27.121-87.27+73.34
125.98-125.46-52.25
136.23+136.17-40.36
17.93+116.83+17.23
baif tìm x
|x-3|=|5|+|7|
4-(7-x)=x-(13-4)
Bài 1
a) 48.(19+115) + 134.52 = 48.134 + 134.52 = 134.(48+52) = 134.100 = 13400
các câu khác tương tự nhé
Bài 2:a
Ix-3I = I5I + I7I
=>Ix-3I = 5+7 = 12
=> X-3 = 12 hoặc x-3 = -12
X=15 x = -9
b Bn tự làm nhé, ở câu này bn hãy chuyển vị trí làm sao cho vế có biến ở một bên và số không có một biến ở một bên là ra đấy.
A) 58.75+58.50-58.25
B) 27.39+27.63-2.27
C) 128.46+128.32+128.22
D) 12.35+35.182-35.94
E) 48.19+48.115+134.52
F) 136.23+136.17-40.36
G) 17.93+116.83+17.23
H) 19.27+47.81+19.20
I) 87.23+13.93+70.87
a,
58.75 + 58.50 - 58.25
= 58.(75 + 50 - 25)
= 58. (125 - 25)
= 58.100
= 5800
b, 27.39 + 27.63 - 2.27
= 27.(39 + 63 - 2)
= 27.(102 - 2)
= 27.100
= 2700
c, 128.46 + 128.32 + 128.22
= 128.(46 + 32 + 22)
= 128.(78 + 22)
= 128.100
= 12800
1.Tính nhanh:
a) 35.23+35.41+64.65
b)29.87-29.23+64.71
c)48.19+48.115+134.52
d)27.121-87.27+73.34
e)125.98-125.46-52.25
f)136.23+136.17-40.36
g)17.93+116.83+17.23
h)19.27+47.81+19.20
i)87.23+13.93+70.87
2.Tìm X:
a.[(6.x-39):7].4=12
b.(x:3-4).5=15
c.128-3.(x+4)=23
d.\(\left(3.x-3^4\right).7^3=2.7^4\)
x-[42+(-28)]=-8
g) x-7=-5
h) 15-5.(x+4)=-12-3
i) (7-x)-(25+7)=-25
k) 0:x=0
l) \(4^x=64\)
m) \(9^{x-1}=9\)
n) \(2^x:2^5=1\)
1)
a) 35.23 + 35.41 + 64.65 = 35(23+41) + 64.65 = 35 . 65 + 64.65 =65. 99 = 65(100 - 1 ) = 6500 - 65 = 6435
b) 29.87 - 29.23 + 64.71 = 29(87-23) + 64.71 = 29.64 + 64.71 = 64(71+29) = 64.100= 6400
c) 48.19 + 48.115 + 134.52 = 48(19+115) + 134.52 = 48 . 134+134.52=134(52+48)=134.100=13400
d) 27.121 - 87.27 + 73.34 = 27(121-87) +73 .34 = 27 .34 + 73.34 = 34(73+27)=34.100=3400
e) 125.98-125.46-52.25 = 125(98-46) -52.25 = 125 . 52 - 52.25 =52(125-25) =52.100=5200
f)136.23 + 136.17 - 40.36 = 136(23+17) - 40.36 = 136.40 -40.36 = (136-36)40 = 100.40=4000
g) 17.93 + 116.83 + 17.23 = 17(93+23) + 116.83 = 17.116 + 116.83 =116(83+17) = 116.100=11600
h)19.27 +47.81 + 19.20 = 19(27+20) + 47.81 = 19. 47 + 47.81 = 47(81+19)=47.100 = 4700
i) 87.23 + 13.93 + 70.87 = 87(23+70) + 13.93 = 87 .93 + 13.93 = 93(87+13)=93.100=9300
2)Tìm x
a) [(6x-39):37].4 = 12
(6x - 39) : 37 = 12 : 4 = 3
x =(3.37 + 39): 6 = 25
b) ( x : 3 - 4 ) .5=15
x : 3 -4 = 3
x = (3+4).3 = 21
c) 128 - 3(x+4) =23
3x + 12 = 128 -23 = 105
x = (105-12):3 = 31
d) (3x - 34).73=2.74
3x - 81 = 2.74:73=2.7=14
x =(81 + 14 ) : 3= \(31\frac{2}{3}\)
e) x - [42 + (-28) ] = -8
x - 14 = -8
x- 14 + 14 = -8 + 14
x = 6
a) 29.75.2 +58.50 - 58.25
b)9.39.3 + 27.63 - 2.27
c) 64.46.2 + 16.32.8 + 128.22
d) 6.25.11 + 5.22.3 + 66.14 + 33.66
e) 12.35 + 35.182 - 35.94
f) 48.19 + 48.115 + 134. 52
g) 27.121 - 87.27 + 73.34
h) 125.98 - 125.46 - 52.25
a, 5800
b, 2700
c, 12800
d, 5082
e, 10080
f, 13400
g, 5020
h, 5200
a) 29.75.2+58.50-58.25 b) 9.39.3+27.63-2.27
= (29.2).75+58.50-58.25 = (9.3).39+27.63-2.27
= 58.75+58.50-58.25 = 27.39+27.63-2.27
= 58.(75+50-25) = 27.(39+63-2)
= 58.100 = 27.100
= 5800. = 2700.
c)64.46.2+16.32.8+128.22 d)6.25.11+5.22.3+66.14+33.66
= (64.2).46+(16.8).32+128.22 = (6.11).25+5.(22.3)+66.14+33.66
= 128.46+128.32+128.22 = 66.25+5.66+66.14+33.66
= 128.(46+32+22) = 66.(25+5+14+33)
= 128.100 = 66.77
= 12800. = 5082
a) 29 . 75 . 2 + 58 . 50 - 58 . 25
= (29 . 2) . 75 + 58 . 50 - 58 . 25
= 58 . 75 + 58 . 50 - 58 . 25
= 58 . (75 + 50 - 25)
= 58 . (125 - 25)
= 58 . 100
= 5800
b) 9 . 39 . 3 + 27 . 63 - 2 . 27
= (9 . 3) . 39 + 27 . 63 - 2 . 27
= 27 . 39 + 27 . 63 - 2 . 27
= 27 . (39 + 63 - 2)
= 27 . (102 - 2)
= 27 . 100
= 2700
c) 64 . 46 . 2 + 16 . 32 . 8 + 128 . 22
= (64 . 2) . 46 + (16 . 8) . 32 + 128 . 22
= 128 . 46 + 128 . 32 + 128 . 22
= 128 . (46 + 32 + 22)
= 128 . (78 + 22)
= 128 . 100
= 12800
d) 6 . 25 . 11 + 5 . 22 . 3 + 66 . 14 + 33 . 66
= (6 . 11) . 25 + 5 . (22 . 3) + 66 . 14 + 33 .66
= 66 . 25 + 5 . 66 + 66 . 14 + 33 .66
= 66 . (25 + 5 + 14 + 33)
= 66 . (30 + 14 + 33)
= 66 . (44 + 33)
= 66 . 77
= 5082
e) 12 . 35 + 35 . 182 - 35 . 94
= 35 . (12 + 128 - 94)
= 35 . (140 - 94)
= 35 . 46
= 1610
f) 48 . 19 + 48 . 115 + 134 . 52
= 48 . (19 + 115) + 134 . 52
= 48 . 134 + 134 . 52
= 134 . (48 + 52)
= 134 . 100
= 13400
g) 27 . 121 - 87 . 27 + 73 . 34
= 27 . (121 - 87) + 73 . 34
= 27 . 34 + 73 . 34
= (27 + 73) . 34
= 100 . 34
= 3400
h) 125 . 98 - 125 . 46 - 52 . 25
= 125 . (98 - 46) - 52 . 25
= 125 . 52 - 52 . 25
= (125 - 25) . 52
= 100 . 52
= 5200
1.Tính nhanh:
a) 35.23+35.41+64.65
b)29.87-29.23+64.71
c)48.19+48.115+134.52
d)27.121-87.27+73.34
e)125.98-125.46-52.25
f)136.23+136.17-40.36
g)17.93+116.83+17.23
h)19.27+47.81+19.20
i)87.23+13.93+70.87
2.Tìm X:
a.[(6.x-39):7].4=12
b.(x:3-4).5=15
c.128-3.(x+4)=23
d.\(\left(3.x-3^4\right).7^3=2.7^4\)
x-[42+(-28)]=-8
g) x-7=-5
h) 15-5.(x+4)=-12-3
i) (7-x)-(25+7)=-25
k) 0:x=0
l) \(4^x=64\)
m) \(9^{x-1}=9\)
n) \(2^x:2^5=1\)
1. Tính nhanh:
a, 35.23+35.41+64.65
= 35. (23+41) +64.65
= 35. 64 + 64.65
= 64. ( 35 + 65 )
= 64 . 100
= 6400
b, 29.87 - 29.23 + 64.71
= 29.(87-23) + 64.71
= 29.64 + 64.71
= 64.(29 + 71)
= 64.100
= 6400
c, 48.19 + 48.115 + 134.52
= 48.(19 + 115) + 134.52
= 48.134 + 134.52
= 134.(48 + 52)
= 134.100
= 13400
d, 27.121 - 87.27 + 73.34
= 27.(121 - 87) + 73.34
= 27.34 + 73.34
= 34.(27 + 73)
= 34.100
= 3400
e, 125.98 - 125.46 - 52.25
= 125.(98 - 46) - 52.25
= 125.52 - 52.25
= 52.(125 - 25)
= 52.100
= 5200
f, 136.23 + 136.17 - 40.36
= 136.(23 + 17) - 40.36
= 136.40 - 40.36
= 40.(136 - 36)
= 40.100
= 4000
g, 17.93 + 116.83 + 17.23
= 17.(93+23) + 116.83
= 17.116 + 116.83
= 116.(17 + 83)
= 116.100
= 11600
Lát nữa mình làm tiếp, giờ mình phải đi học rồi
TÍNH NHANH
a) 58.75+58.50-58.25
b)27.39+27.63-2.27
c)128.46+128.32+128.22
a)58.75+58.50-58.25
=58.(75+50-25)
=58.100
=5800
b)27.39+27.63-2.27
=27.(39+63-2)
=27.100
=2700
c)128.46+128.32+128.22
=128.(46+32+22)
=128.100
=12800
a) 58.75 + 58 . 50 - 58 . 25
= 58 . ( 75 + 50 - 25 )
= 58 . 100
= 5800
b) 27 . 39 + 27 . 63 - 2 . 27
= 27 . ( 39 + 63 - 2 )
= 27 . 100
= 2700
c) 128 . 46 + 128 . 32 + 128 . 22
= 128 . ( 46 + 32 + 22 )
= 128 . 100
= 12800
a) 58.75 + 58.50 - 58.25 = 58(75 + 50 - 25) = 58.100 = 5800
b) 27.39 + 27.63 - 2.27 = 27(39 + 63 -2) = 27.100 = 2700
c) 128.46 + 128.32 +128.22 = 128(46 + 32 + 22) = 128.100 = 12800
1. Tính nhanh
a) 58.75+58.50-58.25 e)48.19+48.114+134.52
b) 128.35+128.32+ 128.22. f) 27.121-87.27+73.34
c) 12.35+53.182-35.94 g) 125.98-125.46-52.25