X x 14-13 x 2= 112:76
tìm x : X x 14 - 13 x 2 = 112 : 76
X x 14 - 13 x 2 = 1,473684211
X x 14 - 26 = 1,473684211
X = (1,473684211 + 26) : 14
X = 27,473684211 : 14
X = 1,962406015
Tìm x biết:
a ) | x | = 1 5 + 3 4 ; b ) | x − 5 | = − − 5 3 + 1 4 ;
c ) x − 1 4 = 3 2 + 1 3 − 7 6 ; d ) x − 4 3 = 1 6 + 5 3 − 1 2 + 7 12 .
a ) x = 19 20 x = 19 20 b ) x = 83 12 x = − 37 12
c ) x = 31 12 x = − 25 12 d ) x = 13 4 x = − 7 12
Tìm x, biết:
a) x − 1 4 = 3 2 + 1 3 − 7 6
b) x − 4 3 = 1 6 + 5 3 − 1 2 + 7 12
a) x = 31 12 x = − 25 12
b) x = 13 4 x = − 7 12
tìm x
71-(33+x)=76
(x+73)-26=76
45-(x+9)=6
x-73-(-14)=45
(x-7)-25=-13
(x-4)-120= -100
a) 71-(33+x) = 76
71-33-x=76
38-x=76
x = -38
các bài cn lại bn lm tương tự nha!
71 - ( 33 + x ) = 76
33 + x = -5
x = -38
Vậy .....
( x + 73 ) - 26 = 76
x + 73 = 102
x = 29
Vậy ....
Tìm x biết :
A) x + 13 = 32 - 76
B) (-15) + x = (-14) - (-57)
\(x+13=32-76\)
\(\Leftrightarrow x+13=-44\)
\(\Leftrightarrow x=-44-13\)
\(\Leftrightarrow x=-57\)
\(-15+x=-14-\left(-57\right)\)
\(\Leftrightarrow-15+x=-14+57\)
\(\Leftrightarrow-15+x=43\)
\(\Leftrightarrow x=43+15=58\)
A) x + 13 = 32 - 76
x + 13= -44
x = (-44) - 13
x = -57
Vậy x = -57
B) (-15) + x = (-14) - (-57)
(-15) + x = (-14) + 57
(-15) + x = 43
x = 43 + (-15)
x = 43 - 15
x = 28
Vậy x = 18
=))
Tìm x, biet
a)x+13=32-76
b)(-15)+x=(-14)-(-57)
a) x+13 = 32 -76
x+13 = -44
x = -44 -13
x = -57
=> x = -57
b) (-15)+x = (-14)-(-57)
(-15) +x = 43
x = 43 -(-15)
x =58
=> x = 58
tic nhé
a) x+13=32-76
x+13=-44
x=(-44)-13
x=-57
b)(-15)+x=(-14)-(-57)
(-15)+x=43
x=43-(-15)
x=58
76. Tính giá trị biểu thức sau một cách hợp lí:
A=719.811+719.311+1219A=719.811+719.311+1219 ;
B=59.713+59.913−59.313B=59.713+59.913−59.313 ;
C=(67111+233−15117).(13−14−112)C=(67111+233−15117).(13−14−112).
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Tìm x ∈ ℤ ,biết:
a ) 3 8 + − 11 8 < x < 22 9 + 5 18 ; b ) − 7 8 + 5 6 < x 24 < 2 3 + − 5 8 ; c ) 1 3 + 1 4 + 1 12 ≤ x ≤ 7 10 + 27 6 ; d ) − 31 14 + 115 161 + 111 74 < x ≤ 6 36 + 9 27 + 48 96
a) – 1 < x < 49 18 => x ∈ {0;1;2}
b) − 1 24 < x 24 < 1 14 => x = 0
c) 2 3 ≤ x ≤ 26 5 => x ∈ {1;2;3;4;5}
d) 0 < x ≤ 1 => x = 1
Bài 142: Tính bằng cách hợp lí
1) 112 x 5 x 2. 2)2 x 247 x5
3) 2 x 4 x 3 x 5. 4) 20 x 7 x 5 x 8
5) 25 x 35 x 4. 6) 47 x 7 + 47 x3
7)5 x 7 x 9 x 2. 8)125 x 9 x 7 x 8
9) 4 x 97 x 25. 10) 8 x 9 10
11) 240 x 24 + 240 x 24. 12) 27 x 2 + 27 x 3 + 27 x 5
13) 48 x 4 + 48 x 3 + 48 x 2 + 48. 14) 247 x 36 + 247 x 64
15)76 x6 + 76 x 4. 16)249 x 101 - 249
TL :
1) 112 x 5 x 2
= 112 x 10
=1120
2) 2 x 247 x 5
= 247 x 10
= 2470
3) 2 x 4 x 3 x 5
= 12 x 10
= 120
4) 20 x 7 x 5 x 8
= 100 x 56
= 5600
5) 25 x 35 x 4
= 100 x 35
= 3500
6) 47 x 7 + 47 x 3
= 47 x ( 7 + 3 )
= 47 x 10
= 470
7) 5 x 7 x 9 x 2
= 10 x 63
= 630
8) 125 x 9 x 7 x 8
= 1000 x 63
= 63000
9) 4 x 97 x 25
= 100 x 97
= 9700
10) 8 x 9 x 10 ( chắc thế )
= 80 x 9
= 720
11) 240 x 24 + 240 x 24
= 24 x ( 240 + 240 )
= 24 x 480
= 11520
12) 27 x 2 + 27 x 3 + 27 x 5
= 27 x ( 2 + 3 + 5 )
= 27 x 10
= 270
13) 48 x 4 + 48 x 3 + 48 x 2 + 48
= 48 x 4 + 48 x 3 + 48 x 2 + 48 x 1
= 48 x ( 4 + 3 + 2 + 1 )
= 48 x 10
= 480
14) 247 x 36 + 247 x 64
= 247 x ( 36 + 64 )
= 247 x 100
= 24700
15) 76 x 6 + 76 x 4
= 76 x ( 6 + 4 )
= 76 x 10
= 760
16) 249 x 101 - 249
= 249 x 101 - 249 x 1
= 249 x ( 101 - 1 )
= 249 x 100
= 24900
Mong các ban cho tui 10 cái T I C K
~HT~