Tính: 7/8 - 7/16 - 11/32 = ?
gấp lắm!!!!
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\(=\dfrac{28}{32}-\dfrac{14}{32}-\dfrac{11}{32}=\dfrac{3}{32}\)
Ta có: \(7^{64}-48\left(7^2+1\right)\left(7^4+1\right)\left(7^8+1\right)\left(7^{16}+1\right)\left(7^{32}+1\right)\)
\(=7^{64}-\left(7^2-1\right)\left(7^2+1\right)\left(7^4+1\right)\left(7^8+1\right)\left(7^{16}+1\right)\left(7^{32}+1\right)\)
\(=7^{64}-\left(7^4-1\right)\left(7^4+1\right)\left(7^8+1\right)\left(7^{16}+1\right)\left(7^{32}+1\right)\)
\(=7^{64}-\left(7^{64}-1\right)\)
\(=7^{64}-7^{64}+1\)
\(=1.\)
Câu hỏi của Thd - Toán lớp 5 - Học trực tuyến OLM
bạn ấn vào link trên nhé
\(\dfrac{7}{8}-\dfrac{7}{16}-\dfrac{11}{32}=\dfrac{7.4}{8.4}-\dfrac{7.2}{16.2}-\dfrac{11}{32}=\dfrac{28}{32}-\dfrac{14}{32}-\dfrac{11}{32}=\dfrac{28-14-11}{32}=\dfrac{3}{32}\)
1.\(\dfrac{8}{11}+\dfrac{8}{33}\times\dfrac{3}{4}=\dfrac{8}{11}+\dfrac{8\times3}{33\times4}=\dfrac{8\times12}{11\times12}+\dfrac{8\times3}{33\times4}=\dfrac{8\times15}{132}=\dfrac{120}{132}=\dfrac{10}{11}\)
2.\(\dfrac{7}{9}\times\dfrac{3}{14}:\dfrac{5}{8}=\dfrac{7}{9}\times\dfrac{3}{14}\times\dfrac{8}{5}=\dfrac{4}{15}\)
3.\(\dfrac{5}{12}-\dfrac{7}{32}:\dfrac{21}{16}=\dfrac{5}{12}-\dfrac{7}{32}\times\dfrac{16}{21}=\dfrac{5}{12}-\dfrac{1}{6}=\dfrac{5-2}{12}=\dfrac{3}{12}=\dfrac{1}{4}\)
`@V.Tr.V`
8 x 2 = 16 8 x 4 = 32 8 x 7 = 56 8 x 5 = 40
16 : 8 = 2 32 : 8 = 4 56 : 8 = 7 40 : 8 = 5
16 : 2 = 8 32 : 4 = 8 56 : 7 = 8 40 : 5 = 8
8 x 2 = 16 8 x 4 =32 8 x 7 =56 . 8 x 5 =40
16 : 8 = 2 32 : 8 =4 56 : 8 =7 40 : 8 =5
16 : 2 = 8 32 : 4 = 8 56 : 7 = 8 40 : 5 = 8
cái bài này bạn thuộc phép nhân chia của nó là làm dễ lắm nha
a)2/5+3/10-1/2=7/10-1/2=2/10=1/5
b)8/11+8/33x3/4=8/11+2/11=10/11
c)7/9x3/14:5/8=1/6:5/8=8/30+4/15
d)5/12-7/32:21/16=5/12-1/6=3/12
nha
a) 2/5+3/10-1/2
= 4/10+3/10-5/10
= 2/10 = 1/5
b) 8/11+8/33x3/4
= 8/11+2/11
= 10/11
c) 7/9x3/14:5/8
= 1/6:5/8
= 1/6x8/5
=4/15
d) 5/12-7/32:21/16
= 5/12-7/32x16/21
= 5/12-1/6
= 5/12-2/12
= 3/12
=\(\dfrac{3}{32}\)