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稍复杂的方程

稍复杂的方程. 列方程解应用题的一般 步骤是什么?. 弄清题意,找出未知数, 用 X 表示;. (2) 找出应用题中数量之间的相 等关系,列方程;. (3) 解方程;. (4) 检验,写出答案。. 苹果 3㎏ ,单价 2.4 元,梨 2㎏ ,单价 2.8 元。. 一共多少钱?. 解下列方程 2(ⅹ-2.6)=8 5(ⅹ+1.5)=17.5 8(ⅹ-6.2)=41.6 (ⅹ-3) ÷=7.5.

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稍复杂的方程

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  1. 稍复杂的方程

  2. 列方程解应用题的一般 步骤是什么? • 弄清题意,找出未知数, • 用X表示; (2) 找出应用题中数量之间的相 等关系,列方程; (3) 解方程; (4) 检验,写出答案。

  3. 苹果3㎏,单价2.4元,梨2㎏,单价2.8元。 一共多少钱?

  4. 解下列方程 2(ⅹ-2.6)=8 5(ⅹ+1.5)=17.5 8(ⅹ-6.2)=41.6 (ⅹ-3) ÷=7.5

  5. 天津到济南的铁路长 357 千米。 一列快车从天津开出,同时有一列慢车从济南开出,两车相向而行,经过3小时相遇,快车平均每小时行 79千米,慢车平均每小时多少千米? 做一做 每小时?千米 慢车 快车 每小时79千米 天津 济南 357千米 想:相遇时,快车所行的路程加上慢车所行的路程等于什么? 解:设慢车平均每小时行X千米。 79 × 3 + 3X= 357 3(79 +X)= 357 237+ 3X= 357 79 + X = 3573 3X= 120 X = 119 –79 X= 40 X= 40 答:慢车平均每小时行40千米。

  6. 再见!

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