1\\ 0.1cm\min 1- 2- 4 cm
2\\ 4m 2m3\h
3\\ 4m 1.2m3\h ֿ
4\\ x2+y2=20 (x) (y)
1\\ 0.1cm\min 1- 2- 4 cm
2\\ 4m 2m3\h
3\\ 4m 1.2m3\h ֿ
4\\ x2+y2=20 (x) (y)
2x dy/dt=-y dy/dt
. a ١٥ a ٢٠ ٥
: 1 (0 1 )
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