Toán Lớp 7: 15 1/4 : (-5/7) – 25 1/4 : (-5/7) = …
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Toán Lớp 7: 15 1/4 : (-5/7) – 25 1/4 : (-5/7) = …
Comments ( 2 )
15 1/4 : (-5/7) – 25 1/4 : (-5/7)
= ( 15 1/4 – 25 1/4 ) : (-5/7)
= ( 61/4 – 101/4 ) : (-5/7)
= (-10 ) : (-5/7)
= 14
Answer
15 1/4 : {-5}/7 – 25 1/4 : {-5}/7
= 15 1/4 xx {-7}/5 – 25 1/4 xx {-7}/5
= {-7}/5 xx (15 1/4 – 25 1/4)
= {-7}/5 xx (-10)
= 14