(4.2+16又5∕4÷8)×21∕5

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(4.2+16又5∕4÷8)×21∕5

(4.2+16又5∕4÷8)×21∕5
(4.2+16又5∕4÷8)×21∕5

(4.2+16又5∕4÷8)×21∕5
(4.2+16又5∕4÷8)×21∕5
=(4.2+2.1)×21∕5
=6.3×21/5
=1.5