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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{373737}{474747}+\dfrac{5757}{4747}\)
\(\left(=\dfrac{373737:10101}{474747:10101}+\dfrac{5757:101}{4747:101}\right)\)
\(=\dfrac{37}{47}+\dfrac{57}{47}=\dfrac{37+57}{47}=\dfrac{94}{47}=2\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Lời giải:
$\frac{373737}{474747}+\frac{5757}{4747}$
$=\frac{373737:10101}{474747:10101}+\frac{5757:101}{4747:101}$
$=\frac{37}{47}+\frac{57}{47}=\frac{94}{47}=2$
![](https://rs.olm.vn/images/avt/0.png?1311)
Đáp án là 0 bạn nhá !
Thử quy đồng số 2/5 ra mẫu số là 10 rồi trừ y như trừ số tự nhiên đó !
Vậy thôi hà !
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{5,4:0,4\times1420+4,5\times780\times3}{3+6+9+12+15+18+21+24+27}\)
\(=\frac{13,5\times1420+13,5\times780}{\left(3+27\right)+\left(6+24\right)+\left(9+21\right)+\left(12+18\right)+15}\)
\(=\frac{13,5\times\left(1420+780\right)}{30+30+30+30+15}\)
\(=\frac{13,5\times2200}{135}\)
\(=\frac{29700}{135}\)
\(=220\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 2:
\(a.\left(y+3,02\right):1,5=6,9\times0,3.\\ \Leftrightarrow\left(y+3,02\right):1,5=2,07.\\ \Leftrightarrow y+3,02=3,105.\\ \Leftrightarrow y=0,085.\)
\(b.16,15:\left(y\times19\right)=17.\\ \Leftrightarrow y\times19=0,95.\\ \Leftrightarrow y=0,05.\)
\(c.0,5\times y:5=10\times0,2.\\ \Leftrightarrow0,5\times y:5=2.\\ \Leftrightarrow0,5\times y=10.\\ \Leftrightarrow y=20.\)
Ta có: \(\frac{373737}{474747}=\frac{373737:10101}{474747:10101}=\frac{37}{47}\)
\(\frac{5757}{4747}=\frac{5757:101}{4747:101}=\frac{57}{47}\)
\(\Rightarrow A=\frac{373737}{474747}+\frac{5757}{4747}=\frac{37}{47}+\frac{57}{47}=\frac{37+57}{47}=\frac{94}{47}=2\)
Vậy A = 2
rút gọn đi:373737/474747= 37/47 5757/4747=57/47
A=37/47+57/47= 94/47=2