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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
\(A=\frac{12\cdot25+4\cdot175\cdot3}{36\cdot\left(101-1\right)+24\cdot\left(99+1\right)}\)
\(A=\frac{12\cdot25+12\cdot175}{36\cdot100+24\cdot100}\)
\(A=\frac{12\cdot100}{60\cdot100}\)
\(A=\frac{1}{5}\)
Bấm L IKE ủng hộ nhá :)))
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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 !
4,25 x 57,43 - 325 + 42,75 x 4,25
= 4,25 x 57,43 + 42,75 x 4,25 - 325
= 4,25 x ( 57,43 + 42,75 ) - 325
= 4,25 x 100,18 - 325
= 425,765 - 325
= 100,765
~ Hok T ~
4,25 x 57,43 - 325 + 42.75 x 5,25
=244,0775 - 325 + 181,6875
=-80,9225 + 181,6875
=100.765
chúc bạn học tốt 😎
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