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a) \(\frac{3}{16}+\frac{4}{15}+\frac{5}{16}+\frac{1}{15}\)
\(=\left(\frac{3}{16}+\frac{5}{16}\right)+\left(\frac{4}{15}+\frac{1}{15}\right)\)
\(=\frac{1}{2}+\frac{1}{3}\)
\(=\frac{5}{6}\)
b) \(\frac{6}{7}\times\frac{8}{15}\times\frac{7}{6}\times\frac{15}{16}\)
\(=\left(\frac{6}{7}\times\frac{7}{6}\right)\times\left(\frac{8}{15}\times\frac{15}{16}\right)\)
\(=1\times\frac{1}{2}=\frac{1}{2}\)
c) \(\frac{19}{20}\times\frac{13}{21}+\frac{9}{20}\times\frac{8}{21}\)
\(=\frac{19\times13}{20\times21}+\frac{9\times8}{20\times21}\)
\(=\frac{247}{420}+\frac{72}{420}\)
\(=\frac{319}{420}\)
a, (6/11+5/11)x3/17
c1:=1x3/17
=3/17
c2:=6/11x3/17+5/11x3/17
=18/197+15/187
=33/187
=3/17
b,3/5x7/9-3/5x2/9
c1:=21/45-6/45
=15/45
=1/3
c2:=3/5x(7/9-2/9)
=3/5x5/9
=1/3
c,( 6/7-4/7):2/5
c1:=2/7:2/5
=2/7x5/2
=5/7
c2,6/7:2/5-4/7:2/5
=6/7x5/2-4/7x5/2
=15/7-10/7
=5/7
d,8/15:2/11+7/15:2/11
c1:=(8/15+7/15):2/11
=1x11/2
=11/2
c2:=8/15x11/2+7/15x11/2
=88/30+77/30
=165/30
=11/2
a) (\(\frac{6}{11}\) + \(\frac{5}{11}\)) x \(\frac{3}{17}\)= \(\frac{11}{11}\) x \(\frac{3}{17}\)= \(1\) x\(\frac{3}{17}\)= \(\frac{3}{17}\)
b) \(\frac{3}{5}\)x\(\frac{7}{9}\)- \(\frac{3}{5}\)x \(\frac{2}{9}\) = \(\frac{3}{5}\)x (\(\frac{7}{9}\)- \(\frac{2}{9}\))= \(\frac{3}{5}\) x \(\frac{5}{9}\)= \(\frac{3}{9}\)
c) (\(\frac{6}{7}\)- \(\frac{4}{7}\)) : \(\frac{2}{5}\)= \(\frac{2}{7}\) x \(\frac{5}{2}\)= \(\frac{5}{7}\)
d) \(\frac{8}{15}\) : \(\frac{2}{11}\) + \(\frac{7}{15}\): \(\frac{2}{11}\)= ( \(\frac{8}{15}\)+ \(\frac{7}{15}\)) x \(\frac{11}{2}\)= 1 x \(\frac{11}{2}\)= \(\frac{11}{2}\)
Chúc học tốt nha!
chữa :
a) \(\frac{6}{25}:\frac{21}{20}=\frac{6}{25}.\frac{20}{21}=\frac{6.20}{25.21}=\frac{3.2.4.5}{5.5.7.3}=\frac{8}{35}\)
8462-x=762
x=8462-762
x=7700
tt nhé
a)X=7700
b)X=12930
c)X=9865
d)X=8294
~ Ủng hộ~
dễ mà!tự làm đi nha
a) 8462 - x = 762
=> x = 8462 - 762
=> x = 7700
b) x : 9 = 1436 (dư 6)
=> x = 1436 x 9 + 6
=> x = 12930
c) x + 21609 : 3 = 17068
=> x + 7203 = 17068
=> x = 17068 - 7203
=> x = 9865
d) x - 3728 : 4 = 7362
=> x - 932 = 7362
=> x = 7362 + 932
=> x = 8294
van thi cam limh
a) 8462 - x = 762
=> x = 8462 - 762
=> x = 7700
b) x : 9 = 1436 (dư 6)
=> x = 1436 x 9 + 6
=> x = 12930
c) x + 21609 : 3 = 17068
=> x + 7203 = 17068
=> x = 17068 - 7203
=> x = 9865
d) x - 3728 : 4 = 7362
=> x - 932 = 7362
=> x = 7362 + 932
=> x = 8294
trả lời cả bài như bùi tiến vũ nhé các bạn
a)7700 b)12930 c)36595 d)33176
minh cung muon lam ra cach lam giup ban luon vi minh dang ban hoc bai nen khong co thoi gian nen moi la dap an khong thoi
xin loi nhe chuc ban hoc tot
bye
a) =7700
b)129249 mình tính thì ko có dư nha)
c)29595
d)34256
a,X=8462-762 b,X=1436x9 c,X=17068-21609:3 d,X=7362+3728:4
X=7700 X=12930 X=17068-7203 X=7362+932
X=9865 X=8294
ko có gì đâu mà
a,x=7700
b,x=12930
c,x=9865
d,x=8284
k nhé mọi người!!
khó thế này]