本课配套习题挑战模式1/5
A: 在a处挂9个质量相同的钩码 |
B: 在b处挂8个质量相同的钩码 |
C: 在c处挂6个质量相同的钩码 |
D: 在d处挂2个质量相同的钩码 |
- 提示1:IEY8c3ViPjE8L3N1Yj5MPHN1Yj4xPC9zdWI+PUY8c3ViPjI8L3N1Yj5MPHN1Yj4yPC9zdWI+
- 提示2:IEY8c3ViPjE8L3N1Yj5MPHN1Yj4xPC9zdWI+PTZ4Mz0xOA==
- 提示3:IEY8c3ViPjI8L3N1Yj5MPHN1Yj4yPC9zdWI+5Lmf5bqU6K+l562J5LqOMTg=
- 答案:Qw==
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
本课配套习题挑战模式2/5
A: 左、右两边各去掉一个钩码 |
B: 左边钩码向左移动1格,右边钩码向右移动1格 |
C: 左、右两边各增加一个钩码 |
D: 右边去掉2个钩码并向右移动3格 |
- 提示1:IEY8c3ViPjE8L3N1Yj5MPHN1Yj4xPC9zdWI+PUY8c3ViPjI8L3N1Yj5MPHN1Yj4yPC9zdWI+
- 提示2:5qC55o2u6aKY55uu6KaB5rGC6K6h566X5bem5Y+z5LmY56ev5piv5ZCm55u4562J5Y2z5Y+v
- 答案:RA==
6K6+5LiA5Liq6ZKp56CB5Li6R++8jOS4gOagvOeahOmVv+W6puS4ukwuIDxicj5B44CB5bem6L6577yaMkfDlzRM77yM5Y+z6L6577yaM0fDlzNM77yM5Y+z6L655LiL5YC+LiA8YnI+QuOAgeW3pui+ue+8mjNHw5c1TO+8jOWPs+i+ue+8mjRHw5c0TO+8jOWPs+i+ueS4i+WAvi4gPGJyPkPjgIHlt6bovrnvvJo0R8OXNEzvvIzlj7PovrnvvJo0R8OXM0zvvIzlt6bovrnkuIvlgL4uIDxicj5E44CB5bem6L6577yaM0fDlzRM77yM5Y+z6L6577yaMkfDlzZM77yM5p2g5p2G5bmz6KGhLiA8YnI+5pWF6YCJRC4g
本课配套习题挑战模式3/5
A: 增加两个钩码 |
B: 减少三个钩码 |
C: 把钩码向右移动一个格 |
D: 把钩码向左移动一个格 |
- 提示1:IEY8c3ViPjE8L3N1Yj5MPHN1Yj4xPC9zdWI+PUY8c3ViPjI8L3N1Yj5MPHN1Yj4yPC9zdWI+
- 提示2:5qC55o2u6aKY55uu6KaB5rGC6K6h566X5bem5Y+z5LmY56ev5piv5ZCm55u4562J5Y2z5Y+v
- 答案:Qw==
5qC55o2u5p2g5p2G5bmz6KGh5p2h5Lu2RjxzdWI+MTwvc3ViPkw8c3ViPjE8L3N1Yj49RjxzdWI+Mjwvc3ViPkw8c3ViPjI8L3N1Yj7vvIzpkqnnoIHnmoTph43lipvkuI7lipvoh4LnmoTkuZjnp6/lupTlj5jkuLrljp/mnaXnmoTkuozliIbkuYvkuIDvvIzlj6/ku6Xph4flj5bljrvmjonkuKTkuKrpkqnnoIHmiJbmiorpkqnnoIHlkJHlj7Pnp7vliqjkuIDkuKrlsI/moLzvvIzmiYDku6VB77yMQu+8jETplJnor6/vvIxD5q2j56GuLiA8YnI+5pWF6YCJQy4g
本课配套习题挑战模式4/5
扁担长1.5m,前端挂200N的货,后端挂300N的货,则肩膀应该位于离扁担前端多少()m处,才能使扁担平衡.(不计扁担的重力)
A: 0.6 |
B: 1.0 |
C: 0.9 |
D: 1.2 |
- 提示1:PHA+5YGH6K6+6Led56a75YmN5q616ZW/5bqm5pivbO+8jOWImei3neemu+WQjuerr+aYrzEuNW0tbDwvcD4=
- 提示2:PHA+RjxzdWI+MTwvc3ViPkw8c3ViPjE8L3N1Yj49RjxzdWI+Mjwvc3ViPkw8c3ViPjI8L3N1Yj48L3A+
- 提示3:PHA+MjAwTlhMPTMwME4oMS41LUwpPC9wPg==
- 答案:Qw==
PHA+5YGH6K6+6Led56a75YmN5q616ZW/5bqm5pivbO+8jOWImei3neemu+WQjuerr+aYrzEuNW0tbCzmoLnmja7mnaDmnYblubPooaHmlrnnqIsyMDBOWEw9MzAwTigxLjUtTCnmsYLop6Ns562J5LqOMC45bTwvcD4=
本课配套习题挑战模式5/5
60kg的人站在跷跷板某一位置时,跷跷板处于如图所示的平衡状态. 由此可估测球的质量约为( )
A: 20kg |
B: 30kg |
C: 120kg |
D: 60kg |
- 提示1:PHA+RjxzdWI+MTwvc3ViPkw8c3ViPjE8L3N1Yj49RjxzdWI+Mjwvc3ViPkw8c3ViPjI8L3N1Yj48L3A+
- 提示2:PHA+5om+5Yiw5Yqo5Yqb77yM5Yqo5Yqb6IeC77yM6Zi75Yqb6Zi75Yqb6IeCPC9wPg==
- 提示3:PHA+5q2k6aKY6ZyA6KaB5Lyw566X77yM55CD5Yiw5pSv54K555qE6Led56a75aSn5qaC5piv5Lq65Yiw5pSv54K56Led56a755qEMuWAjTxicj48L3A+
- 答案:Qg==
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