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<br class="Apple-interchange-newline"><div></div>A=12,25×(x+64,35)−225
Để A=755thì :
12,25×(x+64,35)−225=755
12,25×(x+64,35)=755+225
12,25×(x+64,35)=980
x+64,35=80
x=15,65
Vậy x=15,65để A=755
Nếu a = 35, 65 thì ta có biểu thức:
12, 25 x 35, 65 + 64, 35 - 225
= 788, 2875 + 64, 35 - 225
= 852, 6375 - 225
= 627, 6375
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
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
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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 :)))
1. Nếu giảm mỗi đáy 15 m thì diện tích thửa ruộng giảm 450 m2 => chiều cao hình thang à:
450 × 2 : 15 = 60 (m)
=> tổng độ dài đáy bé và đáy lớn là:
4200 × 2 : 60 = 140 (m)
Tổng số phần bằng nhau là:
3 + 1 = 4 ( phần = nhau)
Giá trị 1 phần hay đáy bé là:
140 : 4 = 35 (m)
Đáy lớn là:
35 × 3 = 105 (m)
2. a, Với x = 42, A = 42 : 3 + 6 = 14 + 6 = 20
b, Ta có: A = x : 3 + 6 = 10
=> x : 3 = 10 - 6 = 4
=> x = 4 × 3 = 12
Bài 1: A = (\(\dfrac{7}{13}\) + \(\dfrac{6}{13}\)) x 100 - 13 x a
Thay a = 10 vào A ta có:
A = (\(\dfrac{7}{13}\) + \(\dfrac{6}{13}\)) x 100 - 13 x 10
A = \(\dfrac{13}{13}\) x 100 - 130
A = 100 - 130
A = - 30
Thay a = 987 vào biểu thức A ta có:
A = (\(\dfrac{7}{13}\) + \(\dfrac{6}{13}\)) x 100 - 13 x 987
A = \(\dfrac{13}{13}\) x 100 - 12831
A = 100 - 12831
A = -12731
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