1.Andy and Ben each shoots at a target. the probability that the target is hit by Andy and Ben are 0.42 and 0.36 respectively.
( a) Find the probability that both of them hit the target.
(b ) Find the probability that none of them hit the target.
2. in the Figure, XY= 9cm , XZ =8 cm and 角YXZ=140度. fine the area of 三角形XYZ.
A.16cmニ次方 B.17cm二次方 C.23cm二次方 D.36cm二次方
urgent!!!! 中學數學題
2008-03-29 9:34 pm
回答 (1)
2008-03-29 10:02 pm
✔ 最佳答案
1. a) 0.42x0.36=0.15b) 0.58x0.64=0.37
2. the area = 1/2x8x9sin 140
=23cm
the answer is C
收錄日期: 2021-04-29 20:26:16
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