口袋里有同样大小的8个白球、5个黄球和l5个黑球．闭上眼睛从口袋中摸球，至少取出多少个球，才能保证摸出的这几个球中有黑球？
直接写得数．=== 10×====== 4××=
×=÷= 14×=×÷3=×2=÷4=÷=×=÷=÷=×=÷=×= 10÷=×8=÷=×=×=
直接写出得数．﹣=×=÷=×= 1﹣35%=×÷×=
看谁算得快!×= 6÷= 122= 8×3.14=÷= 75×4×2.5%=
直接写出得数．×8=÷2=÷=×=﹣= 6.8÷10%=×= 1÷=÷60%=×15= 4.5+=×=
=
=
= 10×
=
=
=
=
=
= 4×
×
=
×
=
= 14×
=
×
÷3=
×2=
÷4=
÷
=
×
=
=
÷
=
×
=
=
×
= 10÷
=
×8=
÷
=
×
×
﹣
=
×
=
÷
=
×
= 1﹣35%=
×
=
×
= 6÷
= 122=
÷
= 75×4×2.5%=
×8=
÷2=
÷
=
×
=
﹣
= 6.8÷10%=
×
= 1÷
=
÷60%=
=
×
=
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