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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 :)))
Bài 1
a) \(5\times72\times10\times2=\left(5\times2\times10\right)\times72=100\times72=7200\)
b) \(40\times125=5\times\left(8\times125\right)=5\times1000=5000\)
c) \(16\times6\times25=4\times4\times6\times25=\left(4\times6\right)\times\left(4\times25\right)=24\times100=2400\) Bài 2:
a) \(24\times57+43\times24=24\times\left(57+43\right)=24\times100=2400\)
b) \(12\times19+80\times12+12=12\times\left(19+80+1\right)=12\times100=1200\)
c) \(\left(36\times15\times169\right)\div\left(5\times18\times13\right)\)
\(=\left(18\times2\times3\times5\times13\times13\right)\div\left(5\times18\times13\right)\)
\(=\left(2\times3\times13\right)\times\left(18\times5\times13\right)\div\left(5\times18\times13\right)\)
\(=2\times3\times13\)
\(=78\)
d) \(\left(44\times52\times60\right)\div\left(11\times13\times15\right)\)
\(=\left(4\times11\times4\times13\times4\times15\right)\div\left(11\times13\times15\right)\)
\(=\left(4\times4\times4\right)\times\left(11\times13\times15\right)\div\left(11\times13\times15\right)\)
\(=4\times4\times4\)
\(=64\)
Bài 3:
a) \(x-280\div35=5\times54\)
\(x-8=270\)
\(x=270+8\)
\(x=278\)
b) \(\left(x-280\right)\div35=54\div4\)
\(\left(x-280\right)\div35=\dfrac{27}{2}\)
\(x-280=\dfrac{27}{2}\times35\)
\(x-280=\dfrac{945}{2}\)
\(x=\dfrac{945}{2}+280\)
\(x=\dfrac{1505}{2}\)
c) \(\left(x-128+20\right)\div192=0\)
\(x-128+20=0\times192\)
\(x-128+20=0\)
\(x-128=0-20\)
\(x-128=-20\)
\(x=-20+128\)
\(x=108\)
d) \(4\times\left(x+200\right)=460+85\times4\)
\(4\times\left(x+200\right)=460+340\)
\(4\times\left(x+200\right)=800\)
\(x+200=800\div4\)
\(x+200=200\)
\(x=200-200\)
\(x=0\)
Bài 4:
a) \(\dfrac{7}{12}-\dfrac{5}{12}=\dfrac{2}{12}=\dfrac{1}{6}\)
b) \(\dfrac{8}{11}+\dfrac{19}{11}=\dfrac{27}{11}\)
c) \(\dfrac{3}{8}+\dfrac{5}{12}=\dfrac{9}{24}+\dfrac{10}{24}=\dfrac{19}{24}\)
d) \(\dfrac{3}{4}+\dfrac{7}{12}=\dfrac{9}{12}+\dfrac{7}{12}=\dfrac{16}{12}=\dfrac{4}{3}\)
Bài 5:
a) \(x-\dfrac{6}{7}=\dfrac{5}{2}\)
\(x=\dfrac{5}{2}+\dfrac{6}{7}\)
\(x=\dfrac{47}{14}\)
b) \(\dfrac{12}{7}\div x+\dfrac{2}{3}=\dfrac{7}{5}\)
\(\dfrac{12}{7}\div x=\dfrac{7}{5}-\dfrac{2}{3}\)
\(\dfrac{12}{7}\div x=\dfrac{11}{15}\)
\(x=\dfrac{12}{7}\div\dfrac{11}{15}\)
\(x=\dfrac{180}{77}\)
a) X x (6,1 + 3,9) = 72,8
X x 10 = 72,8
X = 7,28
b) 41,2 x X + 58,8 x X = 314
X x (41,2 + 58,8) = 314
X x 100 = 314
X = 3,14
Trả lời
a)(x-24):28=20
x-24 =20.28
x-24 =560
x =560+24
x =604
b)13.(x-6)=39
x-6 =39:13
x-6 =3
x =3+6
x =9
c)x.25=10000:2,5
x.25=4000
x =4000:25
x =160
Rất vui khi đc giúp bn!
a.
(x - 24) : 28 = 20
x - 24 = 20*28
x - 24 = 560
x = 560 + 24
x = 584
a) (492 x 25) : 123
cách 1 : (492 x 25) : 123 = 12300 : 123
= 100
Cách 2 : (492 x 25) : 123 = (492 : 123) x 25
= 4 x 25 = 100
b) 638 : (24 x 7)
Cách 1 : 638 : (24 x 7) = 638 : 168
= 319/84
Cách 2: 638 : (24 x 7) = 638 : 24 : 7
= 319/84
a) \(\dfrac{24}{25}-x=\dfrac{3}{5}\)
\(x=\dfrac{24}{25}-\dfrac{3}{5}\)
\(x=\dfrac{24}{25}-\dfrac{15}{25}\)
\(x=\dfrac{9}{25}\)
b) \(\dfrac{4}{7}-\dfrac{x}{21}=\dfrac{10}{21}\)
\(\dfrac{x}{21}=\dfrac{4}{7}-\dfrac{10}{21}\)
\(\dfrac{x}{21}=\dfrac{12}{21}-\dfrac{10}{21}\)
\(\dfrac{x}{21}=\dfrac{2}{21}\)
\(x=2\)
a) 24/25 - x = 3/5
x =24/25 - 3/5
x = 24/25 - 15/25
x = 9/15
x = 3/5
Vậy x = 3/5
b)4/7 - x/21 = 10/21
x/21 = 4/7 - 10/21
x/21 = 12/21 - 10/21
x/21 = 2/21
vậy x = 2
----------------nếu thấy đúng thì cho mình xin 1like nhó-------------------------
a x 25+ a x24= 58,8
a x49=58,8
=> a=58,8/49
=>a=1,2
a x 25 + a x 24 = 58,8
a x 49 = 58,8
a = 58,8 / 49
a = 1,2 tk mk,mk tk lại!