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4.0 Problem solving lao sample EESDP
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Joel Wayne Ganibe, MBA
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4.0 Problem solving lao sample EESDP
1.
ບົດທີ 7 ການແກ ້ ສ ົ
ມຜ ົ ນທ ີ່ ມ ີ ເລກຮາກຂ ັ້ ນສອງ ເວລາ 2 ຊ ົ່ ວໂມງ ຈ ຸ ດປະສ ົ ງ: ໃຫ້ນັກຮຽນສາມາດແກ ້ ສ ົ ມຜ ົ ນທ ີ່ ມ ີ ເລກຮາກຂ ັ້ ນສອງ. ກ ິ ດຈະກ ໍ າ: ຄູ ນັກຮຽນ ແບ່ ງນັກຮຽນອອກເປັນກຸ່ ມບໍ ່ ເກີນ 5 ຄົນ, ແນະນໍາ, ໃຫ້ໂຈດ ແລະ ຂັ້ນຕອນການແກ້ໂຈດ, ຄ ູ ຕ ິ ດຕາມ ແລະ ແນະນ ໍ າຕ ື່ ມ ເມ ື່ ອເຫ ັ ນວ ່ າຈ ໍ າເປ ັ ນ, ຄ ູ ໃຫ ້ ຕາງໜ ້ າກ ຸ່ ມ ສະເໜ ີ ຜ ົ ນການ ສ ົ ນທະນາ (ອາດຈະແບ ່ ງກ ັ ນ ຕອບ ບ ັ ນດາຄ ໍ າຖາມ), ຈາກນ ັ້ ນ ຄ ູ ໃຫ ້ ຄ ໍ າເຫ ັ ນ, ຄ ໍ າຕອບທ ີ່ ຖ ື ກຕ ້ ອງ ແລະ ສ ິ່ ງທ ີ່ ຄວນ ເອ ົ າໃຈໃສ ່ ໃນບ ົ ດຮຽນ ທ ີ່ ຮຽນມາ ເອ ົ າໃຈໃສ ່ ສ ົ ນທະນາ ພາຍໃນກ ຸ່ ມ ເພ ື່ ອຊອກຫາ ຄ ໍ າຕອບ ຂອງ ຄ ໍ າຖາມທ ີ່ ໃຫ ້ ມາ ແລະ ອ ່ ານຂ ໍ້ ແນະນ ໍ າ ທ ີ່ ຄ ູ ໃຫ ້ , ຈາກນ ັ້ ນ ສະເໜ ີ ຜ ົ ນ ຂອງການ ສ ົ ນທະນາ. ຄ ໍ າຖາມ 1: ຈ ົ່ ງສ ື ບຕ ໍ່ ແກ ້ ສ ົ ມຜ ົ ນຕ ໍ່ ໄປນ ີ ້ ໃນກ ຸ່ ມຈ ໍ ານວນຈ ິ ງ: 1.1 1.2 1.3 ບ ໍ່ ມ ີ ໃຈຜ ົ ນໃນກ ຸ່ ມຈ ໍ ານວນຈ ິ ງ ເພາະວ ່ າຄ ່ າຂອງຮາກຂ ັ້ ນສອງ …... 1.4 ຮອບວຽນຂອງໂຕ ້ ນໂມງ (pendulum) ແມ ່ ນເວລາ T ທ ີ່ ຕ ້ ອງການ ໃຫ ້ ໂຕ ້ ນໂມງໄກວໄປ-ກ ັ ບໜ ຶ່ ງຮອບ ເຊ ີ່ ງເວລາ T ເປ ັ ນວ ິ ນາທ ີ ແລະ T ຂ ຶ ້ ນກ ັ ບລວງຍາວຂອງໂຕ ້ ນໂມງ L ເປ ັ ນ ft (1 ft = 30 cm): . ຈ ົ່ ງຊອກຫາຄ ່ າຂອງ L ເມ ື່ ອ T = 1. 5x +1 = 4 5x +1=16 5x = ... x = ... 6 5- x +2 = 8 5- x =1 5- x = ... x = ... 1- x +3 = 5 x +3 = -4 T = 2p L 32 Interactive teaching sample 4
2.
ຄ ໍ າແນະນ ໍ າ:
ການແກ ້ ສ ົ ມຜ ົ ນ ເພາະວ ່ າຄ ່ າຂອງຮາກຂ ັ້ ນສອງບ ໍ່ ເປ ັ ນຄ ່ າລ ົ ບ, ເມ ື່ ອ B ເປ ັ ນສ ໍ ານວນທ ີ່ ມ ີ ຕ ົ ວລ ັ ບ ຄວນວາງເງ ື່ ອນໄຂ . ດ ັ່ ງນ ັ້ ນ, ການແກ ້ ສ ົ ມຜ ົ ນ ເມ ື່ ອ B ເປ ັ ນສ ໍ ານວນທ ີ່ ມ ີ ຕ ົ ວລ ັ ບ, ມ ີ ສອງຂ ັ້ ນຕອນດ ັ່ ງນ ີ ້ : ຂ ັ້ ນຕອນທ ີ 1. ແກ ້ ສ ົ ມຜ ົ ນ ຂ ັ້ ນຕອນທ ີ 2. ເອ ົ າໃຈຜ ົ ນທ ີ່ ໄດ ້ ຈາກຂ ັ້ ນຕອນທ ີ 1 ກວດຕາມເງ ື່ ອນໄຂ ຫ ຼື ແທນໃສ ່ ສ ົ ມຜ ົ ນ ໃຈຜ ົ ນໃດທ ີ່ ສອດຄ ່ ອງກ ັ ບເງ ື່ ອນໄຂ ຫ ຼື ຖ ື ກຕ ້ ອງ ຈ ຶ່ ງເປ ັ ນຄ ໍ າຕອບ. ຄ ໍ າຖາມ 2. ຈ ົ່ ງສ ື ບຕ ໍ່ ການແກ ້ ສ ົ ມຜ ົ ນຕ ໍ່ ໄປນ ີ ້ : 2.1 ແກ ້ ສ ົ ມຜ ົ ນ ໄດ ້ ກວດຕາມເງ ື່ ອນໄຂ ໄດ ້ ຄ ໍ າຕອບ 2.2 A = B B ³ 0 A = B A = B2 B ³ 0 A = B 2x -1 = 2- x 2x -1= (2- x)2 ,2- x ³ 0 2x -1= (2- x)2 2x -1= 4-4x + x2 x2 -6x +5= 0 x = ...,x = ... 2- x ³ 0 x =... 5x -6 = x
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