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14/15 x 15/16 x 16/17 : 14/51
= 14/16 x 16/17 x 51/14
= 14/17 x 51/14
= 17/51
= 1/3
Tk mk nha !!!
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bải giải
C.dài: 75 cm
C.rộng 60cm
Diện tích phòng học em là:
75 x 60 =4500 ( cm2 )
đáp số: 4500 cm2 .
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\(\frac{3}{5}\times\frac{6}{7}+\frac{3}{5}:7+\frac{6}{5}\)
\(=\frac{3}{5}\times\frac{6}{7}+\frac{3}{5}\times\frac{1}{7}+\frac{6}{5}\)
\(=\frac{3}{5}\times\left(\frac{6}{7}+\frac{1}{7}\right)+\frac{6}{5}\)
\(=\frac{3}{5}\times1+\frac{6}{5}\)
\(=\frac{3}{5}+\frac{6}{5}=\frac{9}{5}\)
~ Hok tốt ~
\(\frac{29}{12}:\frac{1}{2}-\frac{5}{12}:\frac{1}{2}-\frac{1}{2}\)
\(=\left(\frac{29}{12}-\frac{5}{12}\right):\frac{1}{2}-\frac{1}{2}\)
\(=2:\frac{1}{2}-\frac{1}{2}\)
\(=4-\frac{1}{2}=\frac{7}{2}\)
~ Hok tốt ~
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10+11+12+13+14+15+16+17+18+19+20=(10+20)+(11+19)+(12+18)+(13+17)+(14+16)+15
=30+30+30+30+30+15
=30*5+15=150+15=165
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Olm sẽ hướng dẫn em cách làm như sau:
14 + 15 + 16 + 17 + 18 + 19
= (14 + 16) + (15 + 17 + 18) + 19
= 30 + 50 + 19
= 80 + 19
= 99
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3×710+710×5+2×7103×710+710×5+2×710
=710×(3+5+2)=710×(3+5+2)
=710×10=710×10
=7
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1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19
=(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+10
=20×9+10
=180+10
=190
`#3107.101107`
\(\dfrac{14}{15}\times\dfrac{15}{16}\times\dfrac{16}{17}\div\dfrac{14}{51}?\\ =\dfrac{14}{15}\times\dfrac{15}{16}\times\dfrac{16}{17}\times\dfrac{51}{14}\\ =\dfrac{51}{17}\\ =3\)