15分之7除以45分之28等于几分之几
7 28 7 45 7×45 1×3 3
— ÷ — = —× — = ——— = —— = —
15 45 15 28 15×28 1×4 4
7/15÷28/45
=7/15÷(7/15×4/3)
=7/15÷7/15÷4/3
=3/4
=7/15*45/28
=7*3/28
=21/28
解:
7/15÷28/45
=7×45/(15×28)
=3/4
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7 28 7 45 7×45 1×3 3
— ÷ — = —× — = ——— = —— = —
15 45 15 28 15×28 1×4 4
7/15÷28/45
=7/15÷(7/15×4/3)
=7/15÷7/15÷4/3
=3/4
=7/15*45/28
=7*3/28
=21/28
解:
7/15÷28/45
=7×45/(15×28)
=3/4