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三條方程(計算步驟+解釋) +10

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如題:求三條方程答案(計算步驟+解釋) 1) 4 ( x - 0.4 ) - 2 = 11.2 2) 32 - 2x = 18 3) 3/5x - 3 =12 ps:3/5=五分之三 thx

最佳解答:

1)4 ( x - 0.4 ) - 2 = 11.2 4x - 1.6 - 2 = 11.2 (將 4分別乘入括號內既數字) 4x - 3.6 = 11.2 [ - (1.6+2) ] 4x = 14.8 (將 -3.6掉過去右手邊就會變成+) x = 3.7 (將14.8 / 4) 2)32 - 2x = 18 32 - 18 = 2x (將 -2x掉去右手邊變成+再將18掉去左手邊變成-18) 14 = 2x (32-18 = 14) x = 7 (將14 / 2) 3) 3/5x - 3 =12 3/5x = 15 (將 -3掉去右手邊變成+3) 3x = 75 (將5成過去右手邊變成75) x = 25 (將75 / 3) ps : 3/5x = 3x/5

其他解答:

1) 4 ( x - 0.4 ) - 2 = 11.2 4 ( x - 0.4 ) - 2 + 2 = 11.2 + 2 4 ( x - 0.4 ) / 4 = 13.2 / 4 ( x - 0.4 ) = 3.3 x-0.4+0.4 = 3.3 + 0.4 x = 3.7 解釋: 4 ( 3.7 - 0.4 ) - 2 = 11.2 2) 32 - 2x = 18 32 - 2x + 2x = 18 + 2x 32 -18 = 18 + 2x - 18 14 / 2 = 2x / 2 7 = x x = 7 解釋: 32 - 2 × 7 =18 3) 3/5x - 3 =12 3/5x - 3 +3 =12 +3 3/5x ÷ 3/5 =15 ÷3/5 x =25 解釋: 3/5 ×25 - 3 =12|||||1) 4 ( x - 0.4 ) - 2 = 11.2 4(x-0.4) = 13.2 x-0.4=3.3 x=3. 2) 32 - 2x = 18 32-2x=18 32-18=2x 2x=14 x=7 3) 3/5x - 3 =12 3x / 5 - 3 =12, right? 3x/5 = 15 x = 15 * (5/3) x = 25 2009-07-23 13:29:36 補充： 方程的定則: 先加減後乘除
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