3b2≥λb(a b)include

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3b2≥λb(ab)include3b2≥λb(ab)include3b2≥λb(ab)include19.6x14.2x5.2cm假设1n（MN）=1nM1nM假设y=k/x（k≠0）y=cosx=

3b2≥λb(a b)include
3b2≥λb(a b)include

3b2≥λb(a b)include
19.6 x 14.2 x 5.2 cm假设1n（M N）=1nM 1nM假设y=k/x（k≠0）y=cosx=sin（x 丌/2)