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a. $\dfrac{14}{15}+\dfrac{2}{11}+\dfrac{1}{15}+\dfrac{4}{11}+\dfrac{10}{22}$
$=(\dfrac{14}{15}+dfrac{1}{15})+(\dfrac{2}{11}+\dfrac{4}{11}+\dfrac{10}{22})$
$=1+1=2$
b. $74\times43-43+27\times43$
$=(74-1+27)\times43$
$=100\times43=4300$
\(a)\dfrac{14}{15}+\dfrac{2}{11}+\dfrac{1}{15}+\dfrac{4}{11}+\dfrac{10}{22}\)
\(=\left(\dfrac{14}{15}+\dfrac{1}{15}\right)+\dfrac{2}{11}+\dfrac{4}{11}+\dfrac{5}{11}\)
\(=1+1=2\)
\(b)74\times43-43+27\times43\)
\(=43\times\left(74-1+27\right)\)
\(=43\times100=4300\)
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(19+1)+(18+2)+(17+3)+(16+4)+(15+5)+(14+6)+(13+7)+(12+8)+(11+9)+20)+10
=20+20+20+20+20+20+20+20+20+20=(20*10)+10
=210
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20
=(1+19)+(2+18)+(3+17)+(4+16)+(5+15)+(6+14)+(7+13)+(8+12)+(9+11)+(10+20)
=20+20+20+20+20+20+20+20+20+30
=(20 x 9) + 30
=180 + 30
=210
tk nha
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14/15+3/11+1/15+3/11=10/22
=[14/15+1/15]+[3/11+3/11]
=[14/15+1/15]+[3/11*2]
= 1+6/11
=17/11
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a) 14/15 + 3/11 + 1/15 + 3/11 + 10/22
= ( 14/15 + 1/15 ) + ( 3/11 + 3/11 + 10/22 )
= 1 + 1
= 2
b) 9,25 + 9,25 x 8 + 9,25
= 9,25 x ( 1 + 8 + 1)
= 9,25 x 10
= 92,5
a/ \(\frac{14}{15}+\frac{3}{11}+\frac{1}{15}+\frac{3}{11}+\frac{10}{22}=\left(\frac{14}{15}+\frac{1}{15}\right)+\left(\frac{3}{11}+\frac{3}{11}+\frac{2x5}{2x11}\right)=\)
\(=\frac{15}{15}+\frac{11}{11}=1+1=2\)
b/ 9,25+9,25x8+9,25=9,25(1+8+1)=9,25x10=92,5
![](https://rs.olm.vn/images/avt/0.png?1311)
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14/15 + 6/11 + 1/15 + 5/11 + 22/11
=(14/15 +1/15)+(6/11 + 5/11 + 22/11)
=1+3
=4
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14/15 + 3/11 + 1/15 + 3/11 + 10/12
= ( 3/11 + 3/11) + (14/15 + 1/15) + 5/6
= 6/11 + 1 + 5/6
= 6/11 + 5/6 +1
= 91/66 +1
=
Đ/S:
mình trình bày hơi xấu, xin lỗi nha
bạn tự tính 91/66 + 1 nha
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nhiều thế!
1.a /4 giờ 18 phút + 15 giờ 45 phút =20 giờ 3 phút
b/12 giờ 34 giây - 5 phút 47 giây = 6 giờ 47 phút
c/12 giờ 34 phút x 3 =1 ngày 13 giờ 42 phút
d/ 10 phút 48 giây : 9 = 1 giờ 12 phút
`2.a / 14/15 + 3/11 + 1/15 +3/11 +10/22 =3/11+(14/15 + 1/15) + 10/22
= 3/11+ 1 + 10/22
= 4/11 + 10 /22
= 18/22
b/9,25 + 9,25 x 8 + 9,25 = 9,25 x (8 + 2)
= 9,25 x 10
= 92,5
Xong rồi nhé.
14/15 + 2/11 + 1/15 + 4/11 + 10/20
=(14/15+1/15)+(2/11+4/11)+10/20
=1+6/11+10/20
=17/11+10/20
=45/22
Cái 17/11 à
1+6/11=17/11
bn ko hiểu chỗ nào bảo mik