A = 18 × ( 373737/424242 + 373737/565656 + 373737/727272)
Giúp mik với bn nào làm nhanh nhất và đúng mik sẽ tik cho♥♡
18 x ( 373737 /424242 + 373737 / 565656 + 373737/ 727272 )
\(=18\times\left(\frac{37\times10101}{42\times10101}+\frac{37\times10101}{56\times10101}+\frac{37\times10101}{72\times10101}\right)\)
\(=18\times\left(\frac{37}{42}+\frac{37}{56}+\frac{37}{72}\right)\)
\(=666\left(\frac{1}{42}+\frac{1}{56}+\frac{1}{72}\right)\)
\(=666\times\left(\frac{1}{6}-\frac{1}{7}+\frac{1}{7}-\frac{1}{8}+\frac{1}{8}-\frac{1}{9}\right)\)
\(=666\times\left(\frac{1}{6}-\frac{1}{9}\right)\)
\(=666\times\frac{1}{18}=37\)
\(18\times\left(\frac{373737}{424242}+\frac{373737}{565656}+\frac{373737}{727272}\right)\)
\(=18\times\left(\frac{37}{42}+\frac{37}{56}+\frac{37}{72}\right)\)
\(=18\times\frac{37}{18}\)
\(=37\)
\(18.\left(\frac{373737}{424242}+\frac{373737}{565656}+\frac{373737}{727272}\right)\)
\(=18.\left(\frac{37}{42}+\frac{37}{56}+\frac{37}{72}\right)\)
\(=18.37.\left(\frac{1}{42}+\frac{1}{56}+\frac{1}{72}\right)\)
\(=666.\left(\frac{1}{6.7}+\frac{1}{7.8}+\frac{1}{8.9}\right)\)
\(=666.\left(\frac{1}{6}-\frac{1}{7}+\frac{1}{7}-\frac{1}{8}+\frac{1}{8}-\frac{1}{9}\right)\)
\(=666.\left(\frac{1}{6}-\frac{1}{9}\right)\)
\(=666.\left(\frac{6}{36}-\frac{4}{36}\right)\)
\(=666.\frac{2}{36}\)
\(=37\)
~ Ủng hộ nhé
tinh 27 * ( 373737/424242*373737/565656*373737/727272)
27.<373737/424242+373737/565656+373737/727272>
27\(\times\le\frac{373737}{424242}+\frac{373737}{565656}+\frac{373737}{727272}\ge\)
\(27\cdot\left(\dfrac{373737}{424242}+\dfrac{373737}{565656}+\dfrac{373737}{727272}\right)\)
\(27\cdot\left(\dfrac{373737}{424242}+\dfrac{373737}{565656}+\dfrac{373737}{727272}\right)\\ =27\cdot\left(\dfrac{37}{42}+\dfrac{37}{56}+\dfrac{37}{72}\right)\\ =27\cdot37\cdot\left(\dfrac{1}{42}+\dfrac{1}{56}+\dfrac{1}{72}\right)\\ =999\cdot\left(\dfrac{1}{6\cdot7}+\dfrac{1}{7\cdot8}+\dfrac{1}{8\cdot9}\right)\\ =999\cdot\left(\dfrac{1}{6}-\dfrac{1}{7}+\dfrac{1}{7}-\dfrac{1}{8}+\dfrac{1}{8}-\dfrac{1}{9}\right)\\ =999\cdot\left(\dfrac{1}{6}-\dfrac{1}{9}\right)\\ =999\cdot\dfrac{1}{18}\\ =\dfrac{111}{2}\)
\(27.\left(\dfrac{373737}{424242}+\dfrac{373737}{565656}+\dfrac{373737}{727272}\right)=\dfrac{111}{2}\)
Tính nhanh :
A = 18 x [ 373737 / 424242 + 373737 / 565656 + 373737 / 727272 ]
\(A=18x\left(\frac{373737}{424242}+\frac{373737}{565656}+\frac{373737}{727272}\right)\)
\(=18x\left(\frac{37x10101}{42x10101}+\frac{37x10101}{56x10101}+\frac{37x10101}{72x10101}\right)\)
\(=18x\left(\frac{37}{42}+\frac{37}{56}+\frac{37}{72}\right)\)
\(=18x\frac{37}{18}\)
\(=37\)
Tính nhanh:
B= \(\frac{373737}{424242}\)+ \(\frac{373737}{565656}\)+ \(\frac{373737}{727272}\)
37/42+37/56+37/72 = 37(1/42+1/56+1/72)=37( 1/6.7 + 1/7.8 + 1/8.9 )= 37( 1/6 - 1/7 + 1/7 - 1/8 + 1/8 - 1/9)= 37( 1/6 - 1/9)= 37.1/18=37/18
37/42 + 37/56 +37/72=37/24 + 37/72= 37/18
1) Sắp xếp các phân số sau theo thứ tự tăng dần:
1963 / 1965; 47 / 49; 25 / 27; 103 / 105; 2009 / 2011; 51 / 53.
2) Tính:
27 × ( 373737 / 424242 + 373737 / 565656 + 373737 / 727272 )
Cả 2 câu của mk đều là câu tự luận nha!
575757/424242+575757/565656+575757/727272
giúp mik nha
ai nhanh nhất mik sẽ tik cho
các bạn ơi viết cách tính giúp mik với