Toán Lớp 4: Bài 193:
a,$\frac{63.81}{135.84}$ b,$\frac{1111.5}{1515.7}$
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Toán Lớp 4: Bài 193:
a,$\frac{63.81}{135.84}$ b,$\frac{1111.5}{1515.7}$
Comments ( 2 )
a,
{ 63. 81 }/{ 135. 84 }
= { 21. 3. 27. 3}/{ 27. 5. 21.4 }
= { 3. 3}/{ 5. 4 }
= 9/20
b,
{ 1111. 5 }/{ 1515. 7 }
= { 11. 101. 5}/{ 15. 101. 7 }
= { 11. 5 }/{ 3.5.7}
= 11/{ 3.7}
= 11/21
a) (63 . 81)/(135.84)
= (21 . 2 . 3 . 27)/(27 . 5 . 21 . 2 . 2 )
= (1 . 1 . 3 . 1)/(1 . 5 . 1 . 1 . 2)
= 3/10
b) (11. 101 . 5)/(1515 . 7 )
= (11 . 101 . 5)(101 . 3 . 5 . 7)
= 11/(3 . 7)
= 11/21