Toán Lớp 5: Biết: a × 1,25 – a : 5 = 15,75. Như vậy, a = …
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Toán Lớp 5: Biết: a × 1,25 – a : 5 = 15,75. Như vậy, a = …
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a x 1,25 – a: 5 = 15,75 ( vì a : 5 = a : 5/1 = a x 1/5 = a x 0,2 )
a x 1,25 – a x 0,2 =15,75
a x ( 1,25 – 0, 2 ) =15,75
a x 1, 05 = 15,75
a = 15,75 : 1,05
a = 15