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\(\frac{31}{25}+\left(\frac{15}{16}-\frac{6}{15}\right)+\frac{1}{16}\)
\(=\frac{31}{25}+\frac{15}{16}-\frac{6}{15}+\frac{1}{16}\)
\(=\left(\frac{31}{25}-\frac{6}{15}\right)+\left(\frac{15}{16}+\frac{1}{16}\right)\)
\(=\frac{21}{25}+1\)
\(=\frac{46}{25}\)
A, 31/25 + ( 15/16 - 6/15) + 1/16
= 31/25 + 15/16 - 6/15 + 1/16
= ( 31/25 - 6/15 ) + ( 15/16 + 1/16 )
= 21/25 + 1
= 46/25
Chú ý: / này là phần nha
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1: \(=-145\cdot13+145\cdot57+57\cdot10-57\cdot145=-1315\)
2: \(=17\cdot15-17\cdot16+16\cdot17-16\cdot20=255-320=-65\)
3: \(=-38\cdot25+38\cdot4-25\cdot4+25\cdot38=13\cdot4=52\)
4: \(=23\cdot145-23\cdot17-145\cdot23+145\cdot6=479\)
5: \(=24\cdot15-24\cdot4+4\cdot24-4\cdot15=360-60=300\)
6: \(=199\left(15-17+17-5\right)=199\cdot10=1990\)
7: \(=-39\cdot5+39\cdot99+99\cdot10-99\cdot39=795\)
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Câu a:
Ta thấy 37 - 37 = 0
nên nhóm lại kết quả là 14 + 26 = 40
Câu b:
tương tự, kết quả là 6 + 10 = 16
Các câu còn lại như vậy
( -37)+14 +26 +37
=( -37 )+ 37 + (14 + 26 )
=0 +40 = 40
- 24 + 6 +10 +24
=( -24 ) + 24 +( 6 + 10 )
=0 + 16 = 16
15 + 23 + (-25 ) + ( -23 )
= 15 + ( -25 ) + 23 +( -23 )
= -10 + 0
= - 10
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1)\(\dfrac{5}{6}\)
2)\(\dfrac{1}{4}\)
3)\(\dfrac{12}{5}\)
4)\(\dfrac{39}{2}\)
5)\(1\)
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a: =-1+17/20=-3/20
b: =(28/60-33/60)*(-25/3)
=(-1/12)*(-25/3)=1/12*25/3=25/36
c: \(=\dfrac{1}{3}\cdot\dfrac{1}{3}=\dfrac{1}{9}\)
\(\frac{31}{25}\) + ( \(\frac{15}{16}\) - \(\frac{6}{15}\) ) + \(\frac{1}{16}\)
= \(\frac{31}{25}\) + \(\frac{43}{80}\) + \(\frac{1}{16}\)
= \(\frac{711}{400}\) + \(\frac{1}{16}\)
= \(\frac{46}{25}\)
\(\frac{31}{25}+\left(\frac{15}{16}-\frac{6}{15}\right)+\frac{1}{16}=\frac{31}{25}+\frac{15}{16}-\frac{6}{15}+\frac{1}{16}\)
\(\frac{31}{25}-\frac{6}{15}+1=\frac{31}{25}-\frac{10}{25}+\frac{25}{25}=\frac{46}{25}\)