E = 92 x 164 -64 x ( 82 +2170 :217 )
tính nhanh nhất có thể
37064 - 64 x ( 82 + 42966 : 217 )
37064 - 64 x ( 82 + 42966 : 217 )
= 37064 - 64 x 280
= 37064 - 17920
= 19144
Bài 1: Tính:
a, 37064 - 64 x ( 82 + 42966 : 217 )
b, 320 - ( 12,5 + 95,25 + 5,25 ) + 84 : 12 x 12,5
Tính :
A= 2016:4 + 4048:2
B = 37064-64 x (82+42966:2017)
C=(100+92 x 42) +( 200-58)x58
D= (1998:18-1443:13)x(16996-1110:30x305)
\(A=2016:4+4048:2\\ =504+2024\\ =2528\\ B=37064-64\cdot\left(82+42966:2017\right)\\ =37064-64\cdot\left(82+21,30193356\right)\\ =37064-64\cdot103,3019336\\ =37064-6611,323748\\ =30452,67625\\ C=\left(100+92\cdot42\right)+\left(200-58\right)\cdot58\\ =\left(100+3864\right)+142\cdot58\\ =3964+8236\\ =12200\\ D=\left(1998:18-1443:13\right)\cdot\left(16996-1110:30\cdot305\right)\\ =\left(111-111\right)\cdot\left(16996-1110:30\cdot305\right)\\ =0\cdot\left(16996-1110:30\cdot305\right)\\ =0\)
bài 13: tìm x biết
a. 124 + (118 - x) = 217
b. 156- (x + 61) = 82
c. 219 - 7(x + 1) = 100
d. (3x - 6). 3 = 3^4
e. 231 - (x - 6) = 1339 : 13
a) 124 + (118 - x) = 217
118 - x = 217 - 124
118 - x = 93
x = 118 - 93
x = 25
b) 156 - (x + 61) = 82
x + 61 = 156 - 82
x + 61 = 74
x = 74 - 61
x = 13
c) 219 - 7(x + 1) = 100
7(x + 1) = 219 - 100
7(x + 1) = 119
x + 1 = 119 : 7
x + 1 = 17
x = 17 - 1
x = 16
d) (3x - 6).3 = 3⁴
3x - 6 = 3⁴ : 3
3x - 6 = 3³
3x - 6 = 27
3x = 27 + 6
3x = 33
x = 33 : 3
x = 11
e) 231 - (x - 6) = 1339 : 13
231 - (x - 6) = 103
x - 6 = 231 - 103
x - 6 = 128
x = 128 + 6
x = 134
a) 124 + (118 - x) = 217
118 - x = 217 - 124
118 - x = 93
x = 118 - 93
x = 25
b) 156 - (x + 61) = 82
x + 61 = 156 - 82
x + 61 = 74
x = 74 - 61
x = 13
c) 219 - 7(x + 1) = 100
7(x + 1) = 219 - 100
7(x + 1) = 119
x + 1 = 119 : 7
x + 1 = 17
x = 17 - 1
x = 16
d) (3x - 6) . 3 = 34
(3x - 6) . 3 = 81
(3x - 6) = 81 : 3
(3x - 6) = 27
3x = 27 + 6
3x = 33
x = 33 : 3
x = 11
e) 231 - (x - 6) = 1339 : 13
231 - (x - 6) = 103
(x - 6) = 231 - 103
x - 6 = 128
x = 128 + 6
x = 134
cô cấm dùng máy tính -)
lớp 9 ms đc dùng:_)
tinh nhanh
e) 64 x 6 + 82 x 4 + 18 x 6
f) 72 x 54 + 144 x 23
tính hợp lí nếu có thể
a) 37064 - 64 x ( 82 + 42966 : 217)
b) 320 - ( 120 x 5 + 95, 25 + 5,25 ) + 864 : 12 x 12,5
[{giải nhanh nhé}]^^^
37064 - 64 x ( 82 + 42966 : 217 )
= 37064 - 64 x ( 82 + 198 )
= 37064 - 64 x 280
= 37064 - 17920
= 19144
b) 320 - ( 120 x 5 + 95, 25 + 5,25 ) + 864 : 12 x 12,5
= 320 - ( 600 + 95, 25 + 5,25 ) + 864 : 12 x 12,5
= 320 - ( 695.25 + 5,25) + 72 x 12,5
= 320 - 700.5 + 900
= -380,5 + 900
= 520
37064 - 64 x ( 82 + 42966 : 217 )
= 37064 - 64 x ( 82 + 198 )
= 37064 - 64 x 280
= 37064 - 17920
= 19144
b) 320 - ( 120 x 5 + 95, 25 + 5,25 ) + 864 : 12 x 12,5
= 320 - ( 600 + 95, 25 + 5,25 ) + 864 : 12 x 12,5
= 320 - ( 695.25 + 5,25) + 72 x 12,5
= 320 - 700.5 + 900
= -380,5 + 900
= 520
chúc bn hok tốt @_@
124+(118-x)=217
156-(x+61)=82
124+(118-x)=217
=>118-x=217-124
=>x=118-93
=>x=25
156-(x+61)=82
=>x+61=156-82
=>x=74-61
=>x=13
X+91/81+x+92/82+x+93/83=3
\(\frac{x+91}{81}+\frac{x+92}{82}+\frac{x+93}{83}=3\)
\(\frac{x+91}{81}-1+\frac{x+92}{82}-1+\frac{x+93}{83}-1=0\)
\(\frac{x+10}{81}+\frac{x+10}{82}+\frac{x+10}{83}=0\)
\(\left(x+10\right)\left(\frac{1}{81}+\frac{1}{82}+\frac{1}{83}\right)=0\)
=> x + 10 = 0 (vì \(\left(\frac{1}{81}+\frac{1}{82}+\frac{1}{83}\right)\ne0\))=> x = -10
82 - (15 + x ) = 92
82 - ( 15 + x ) = 92
15 + x = 82 - 92
15 + x = -10
x = ( -10 ) - 15
x = -25
82 - ( 15 + x ) = 92
15 + x = 82 - 92
15 + x = - 10
x = - 10 - 15
x = - 25
Vậy x = - 25
82 - (15 + x ) = 92
15 + x = 82 - 92
15 + x = -10
x = ( -10) - 15
x = - 25