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MSC=12
\(\frac{2}{3}=\frac{8}{12}\)
\(\frac{15}{20}=\frac{3}{4}=\frac{9}{12}\)
\(\frac{77}{66}=\frac{7}{6}=\frac{14}{12}\)
\(\frac{25}{50}=\frac{1}{2}=\frac{6}{12}\)
Có phải như này ko?
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175 - 50 + 25 - 50
= ( 175 - 25 ) + ( 50 - 50 )
= 150 + 0
= 150
37 * 38 - 18 * 37 + 100
= 37 * ( 38 - 18 ) + 100
= 37 * 20 + 100
= 740 + 100
= 840
TÍCH NHA!
a ) 175 - 50 + 25 - 50
= 125 + 25 - 50
= 150 - 50
= 100
b ) 37 * 38 - 18 * 37 + 100
= 37 * (38 - 18) + 100
= 37 * 20 + 100
= 740 + 100
= 840
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`a, 4/9 + 2/5 + 5/9= (4/9 +5/9) + 2/5= 1 + 2/5= 5/5 + 2/5= 7/5`
`b, 6/13 + 5/8 + 7/13=(6/13 + 7/13) + 5/8=1+5/8= 8/8 + 5/8= 13/8`
`c, 5/11 + 6/25 + 66/121 = ( 5/11 + 66/121 ) + 6/25=1 + 6/25 = 25/25 + 6/25 = 31/25`
`d, 1/2 + 1/3 + 1/4 + 1/6 + 1/12 + 1/24= (1/2 + 1/4) +(1/3 + 1/6) + (1/12 + 1/24)= 3/4 + 1/2 + 1/8= 6/8 + 4/8 + 1/8= 11/8`
`@ yl`
4970 : 5 =994
66.50=3300
2000:25=80
38:5=7,6