5/7+19/25x4+21/25x19

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5/7+19/25x4+21/25x19
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5/7+19/25x4+21/25x19
5/7+19/25x4+21/25x19

5/7+19/25x4+21/25x19
5/7+19/25x4+21/25x19
=5/7+4/25×19+21/25×19
=5/7+19×(4/25+21/25)
=5/7+19×1
=5/7+19
=19又5/7

5/7+19/25X4+21/25X19
=5/7+19/25X4+19/25X21
=5/7+19/25X(4+21)
=5/7+19/25X25
=5/7+19
=19又5/7