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数学来源与生活,又应用于生活!

数学来源与生活,又应用于生活!. 实际问题与一元一次不等式. 龙门中学 宁正文. 复习引入 : 解下列 一元一次方程. 1:2+8X=8+6X 解: 移项:-6X+8X=8-2 合并同类项:2X=6 系数化为1:X=3. 2 :2-8X=8-6X 解: 移项:6X-8X=8-2 合并同类项:-2X=6 系数化为1 : X= -3. 例 1 : 2+8X<8+6X 移项:-6X+8X<8-2 合并同类项: 2 X < 6 系数化为1: X<3. 例 2 :2-8X<8-6X 移项:6X-8X<8-2 合并同类项: -2 X < 6

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数学来源与生活,又应用于生活!

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  1. 数学来源与生活,又应用于生活!

  2. 实际问题与一元一次不等式 龙门中学宁正文

  3. 复习引入: 解下列一元一次方程 1:2+8X=8+6X 解:移项:-6X+8X=8-2 合并同类项:2X=6 系数化为1:X=3 2:2-8X=8-6X 解:移项:6X-8X=8-2 合并同类项:-2X=6 系数化为1:X=-3

  4. 例1: 2+8X<8+6X 移项:-6X+8X<8-2 合并同类项:2X<6 系数化为1:X<3 例2:2-8X<8-6X 移项:6X-8X<8-2 合并同类项:-2X<6 系数化为1:X>-3

  5. 复习引入:从一元一次方程的解法到一元一次不等式的解法复习引入:从一元一次方程的解法到一元一次不等式的解法 1:2+8X=8+6X 移项:-6X+8X=8-2 合并同类项:2X=6 系数化为1:X=3 2: 2+8X<8+6X 移项:-6X+8X<8-2 合并同类项:2X<6 系数化为1:X<3 3:2-8X=8-6X 移项:6X-8X=8-2 合并同类项:-2X=6 系数化为1:X=-3 4:2-8X<8-6X 移项:6X-8X<8-2 合并同类项:-2X<6 系数化为1:X>-3 归纳:1.相同点:求解步骤相同 2.不同点:系数化为1时当未知数的系数为负数时,不等号方向要改变。

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