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解方程（ 2 ）

解方程（ 2 ）. 解方程： 3 （ x – 12 ） = 27. 解法二： 先化简 ， 3 × x– 3× 12=27, 3x– 36=27, 再求 3 x 3x=27+36, 3x=63, 最后求 x x=63 ÷3, x=21. 解法一： 先求 （ x – 12 ）， x– 12=27÷3, x– 12=9, 再求 x x=9+12,

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解方程（ 2 ）

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  1. 解方程（2）

  2. 解方程：3（x–12）= 27 解法二： 先化简，3× x– 3× 12=27, 3x– 36=27, 再求3x 3x=27+36, 3x=63, 最后求x x=63÷3, x=21. 解法一： 先求（x– 12）， x– 12=27÷3, x– 12=9, 再求x x=9+12, x=21. 比一比？

  3. 解方程：3（x–12）= 27 解： x– 12=27÷3 x– 12=9 x=9+12 x=21 检验：把x=21代入原方程3（x– 12）= 27 方程左边= 3 x （x– 12）=3 x（21-12）=27 方程右边=27 因为左边=右边 所以x=21是原方程3（x– 12）= 27的解

  4. 解方程：4（12－x）= 1 12（x＋1.2）= 144

  5. 解方程：x÷13+7 = 20 解：x÷13 =20–7 x÷13 =13 x =13×13 x =169

  6. 解方程：x÷4＋3= 7 6x÷3= 30

  7. 解方程：63–5x = 18 解：5x = 63–18 5x=45 x=45÷5 x=9

  8. 解方程： • 72－2x=28 • 25－4x=75÷5 • 7.4＋ x=6×5.1

  9. （1）x的7倍等于4与21的积，求x。 （2）y减去3的差的2倍是60，求y。 （3）16与一个数的和的4倍是100，求这个数。

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