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\(\frac{7}{9}.\frac{3}{4}:\frac{5}{8}=\frac{7}{12}:\frac{5}{8}=\frac{7}{12}.\frac{8}{5}=\frac{14}{15}\)
a) \(\frac{27}{36}=\frac{3}{4}\)
b) \(\frac{45}{60}=\frac{3}{4}\)
c) \(\frac{2}{4}=\frac{1}{2}\)
d) \(\frac{10}{12}=\frac{5}{6}\)
e) \(\frac{112}{252}=\frac{4}{9}\)
Đúng nha bạn !!@@
\(\frac{1}{3}+\frac{3}{4}x\frac{5}{9}=\frac{1}{3}+\frac{5}{12}=\frac{3}{4}\)
\(\frac{7}{12}-\frac{5}{4}x\frac{2}{15}=\frac{7}{12}-\frac{1}{6}=\frac{5}{12}\)
\(y+\frac{1}{4}=\frac{7}{8}-\frac{3}{8}=y+\frac{1}{4}=\frac{1}{2}=\frac{1}{2}-\frac{1}{4}=\frac{1}{4}\)
\(y-\frac{5}{12}=\frac{2}{3}-\frac{1}{4}=y-\frac{5}{12}=\frac{5}{12}=\frac{5}{12}+\frac{5}{12}=\frac{5}{6}\)
\(\frac{12}{7}xy=\frac{16}{21}=\frac{16}{21}:\frac{12}{7}=\frac{4}{9}\)
\(\frac{5}{4}:y=\frac{7}{12}=\frac{5}{4}:\frac{7}{12}=\frac{15}{7}\)
B=1/2x2/3x3/4x4/5+....x2003/2004
=1x2x3x4x...x2003/2x3x4x5x...x2004
=1/2004
B=1/2.2/3.3/4.4/5.....2003/2004
B=1/2004
(trên tử có 1.2.3.4...2003,mk bớt ở dưới mẫu =trên tử thì sẽ đc kq như z)
(bn viết ra sẽ rõ)
235 x 53 + 235 x 46 + 235
=235 x (53 + 46 + 1)
=235 x 100
=23500
Ht ^^
a.
x + 4/5 = 4/5 + 36/35
x + 4/5 = 64/35
x = 64/35 - 4/5
x = ......
b.
5/7 + x/35 = 4/5
Ta có :
25/35 + x/35 = 28/35
Suy ra x = 28 - 25
x = 3
100x(43x10+43-2x43x5)+500
=100x(43x11-43x10)+500
=100x[43x(11-10)]+500
=100x43+500
=4300+500
=4800
100(43.10+43-2.43.5)+500
=100(430+43-430)+500
=100.43+500
=4300+500
=4800
x\(\times\)(5+2+3)=100
x\(\times\)10=100
x=100\(\div\)10=10
Vậy x =10
a) \(\frac{16}{35}+\frac{8}{35}=\frac{24}{35}\)
b)\(\frac{160}{77}-\frac{28}{77}=\frac{132}{77}=\frac{12}{1}=12\)
c)\(\frac{72}{180}=\frac{18}{45}\)
d) \(\frac{90}{360}=\frac{1}{4}\)
e)\(\left(x+5\right)\cdot3=40755\\ x+5=40755:3\\ x+5=13585\\ x=13585-5\\ x=13580\\ \)
Vậy x = 13580
f)\(57316:\left(x-8\right)=5\\ x-8=57316:5\\ x-8=11463,2\\ x=11463,2+8\\ x=11471,2\)
Vậy x= 11471,2
e) (x + 5) × 3 = 40755
x + 5 = 40755 : 3
x + 5 = 13585
x = 13585 - 5
x = 13580
f) 57316 : (x - 8) = 5
x - 8 = 57316 : 5
x - 8 = 11463,2
x = 11463,2 + 8
x = 11471,2