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a) 4,25 x ( 58,47 + 41,53 ) - 125 = A
4,25 x 100 - 125 = A
425 - 125 = A
300 = A
b) 4,25 x ( a + 41,53 ) - 125 = 53,5
4,25 x ( a + 41,53 ) = 53,5 + 125
4,25 x ( a + 41,53 ) = 178,5
a + 41,53 = 178,5 : 4,25
a + 41,53 = 42
a = 42 - 41,53
a = 0,47
Mình làm trước nên **** cho mình nha !
a) Thay a = 58,47 ta được:
\(A=4,25\times\left(58,47+41,53\right)-125=4,25\times100-125=425-125=300\)
B) Để A = 53,5 thì \(4,25\times\left(a+41,53\right)-125=53,5\)
=> 4,25 x (a+41,53) = 178,5
=> a + 41,53 = 42
=> a = 42 - 41,53
=> a = 0,47
Vậy khi a - 0,47 thì A = 53,5
a, Thay a = 58,47 vào biểu thức A ta được :
A = 4,25 x (58,47 + 41,53) - 125
A = 4,25 x 100 - 125
A = 425 - 125
A = 300
b, Ta có : \(4,25\times\left(a+41,53\right)-125=53,5\)
=> 4,25 x (a + 41,53) = 53,5 + 125
=> 4,25 x (a + 41,53) = 178,5
=> a + 41,53 = 178,5 : 4,25
=> a + 41,53 = 42
=> a = 42 - 41,53
=> a = 0,47
Vậy a = 0,47
c) Ta có: M < 4 => 13,8 : ( 5,6 - x ) < 4
=> 5,6 - x < 13,8:4
5,6 - x < 3,45
x < 5,6 - 3,45
x < 2,15
Vậy x < 2,15
a) Thay a=35,65 vào biểu thức M ta được
M=12,25 x (35,65 + 64,35) - 225
M=12,25 x 100 -225
M=1225 - 225 = 1000
b) Xét M = 755
Nên 12,25 x (a + 64,35) - 225 = 755
12,25 x (a + 64,35) = 755 + 225
12,25 x (a + 64,35)=980
(a + 64,35)=980 : 12,25
a + 64,35=80
a=80 - 64,35=15,65
a) Thay a = 35,65 vào biểu thức M
có: M = 12,25 x ( 35,65 + 64,35) -225
M = 12,25 x 100 -225
M = 1225 -225
M = 1000
b) Để M =755
=> 12,25 x ( a+ 64,35) -225 = 755
12,25 x ( a+64,35) = 755 + 227
12,25 x ( a+ 64,35) = 980
a + 64,35 = 980 : 12,25
a + 64,35 = 80
a = 80 - 64,35
a = 15,65
KL: a = 15,65 để M = 755
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\(A=\frac{12\cdot25+4\cdot175\cdot3}{36\cdot\left(101-1\right)+24\cdot\left(99+1\right)}\)
\(A=\frac{12\cdot25+12\cdot175}{36\cdot100+24\cdot100}\)
\(A=\frac{12\cdot100}{60\cdot100}\)
\(A=\frac{1}{5}\)
Bấm L IKE ủng hộ nhá :)))
a = 4,25 nhân (x + 41,53 ) - 125
a = 4,25 * (58,47 + 41,53 ) - 125
a = 4.25 * 100 - 125
a = 425 - 125
a = 300
ủng hộ mk nha
a, Biết biểu thức A và m,m=59,47 b, Để A= 53,5 ta có:
=>A=4,25 x (59,47 + 40,53) - 125 53,5 = 4,25 x (m + 40,53) -125
A=4,25 x 100 - 125 53,5+125= 4,25 x (m + 40,53) có j sai bạn thông cảm nha
A= 425 - 125 178,5=4,25 x (m + 40,53)
A=325 42=m + 40,53
42 - 40,53 =m
1,47= m
=>m=147