utefdxd的部落格

標題:

• 我想問有冇呢隻體育用品
• 有關中糧控股的問題
• 我想學整ｃａｋｅ，有無人知道旺角邊到有得學？？？

此文章來自奇摩知識+如有不便請留言告知

中一數學題,急用,十五點

發問:

中一方程式 q1. 3x+5=-16 q2. 4-5y=-26 q3. 7分之5-y=3 q4. 2(p-6)=18 q5. 5-九分之x=3 q6. 6(4x+11)=-30 q7. 0.4n+2.9=4.1 q8. 13分之6y-35=-11 q9. 七分之4(5x-1)=8 要有step,超急,15點! 更新: 可否幫我計多一題 四分之一+五分之n=20分之一

最佳解答:

q1. 3x+5=-16 3x = -16 - 5 3x = -21 x = -21/3 x = -7 q2. 4-5y=-26 4+36 = 5y 40 = 5y 40/5 = y 8 = y y = 8 q3. 7分之5-y=3 5/7 - 3 = y 5/7 - 21/7 = y -16/7 = y y = -16/7 q4. 2(p-6)=18 p - 6 = 18/2 p = 9 + 6 p = 15 q5. 5-九分之x=3 5 - x/9 = 3 5 - 3 = x/9 2 = x/9 2 * 9 = x x = 18 q6. 6(4x+11)=-30 4x + 11 = -30/6 4x = -5 - 11 x = -16/4 x = -4 q7. 0.4n+2.9=4.1 0.4n = 4.1 - 2.9 n = 1.2/0.4 n = 3 q8. 13分之6y-35=-11 6y/13 = -11 + 35 6y = 24 * 13 y = 312/6 y = 52 q9. 七分之4(5x-1)=8 4(5x - 1) = 8 * 7 5x - 1 = 56/4 5x = 14 + 1 x = 15/5 x = 3 2011-12-03 21:24:20 補充： q2. 計錯，應該是 : 4-5y=-26 4+26 = 5y 30 = 5y 30/5 = y 6 = y y = 6 2011-12-05 10:49:38 補充： 1/4 + n/5 = 1/20 5/20 + 4n/20 = 1/20 5 + 4n = 1 4n = 1 - 5 4n = -4 n = -1

其他解答:

q1. 3x+5=-16 3x = -16 - 5 3x = -21 x = -21/3 x = -7 q2. 4-5y=-26 4+36 = 5y 40 = 5y 40/5 = y 8 = y y = 8 q3. 7分之5-y=3 5/7 - 3 = y 5/7 - 21/7 = y -16/7 = y y = -16/7 q4. 2(p-6)=18 p - 6 = 18/2 p = 9 + 6 p = 15 q5. 5-九分之x=3 5 - x/9 = 3 5 - 3 = x/9 2 = x/9 2 * 9 = x x = 18 q6. 6(4x+11)=-30 4x + 11 = -30/6 4x = -5 - 11 x = -16/4 x = -4 q7. 0.4n+2.9=4.1 0.4n = 4.1 - 2.9 n = 1.2/0.4 n = 3 q8. 13分之6y-35=-11 6y/13 = -11 + 35 6y = 24 * 13 y = 312/6 y = 52 q9. 七分之4(5x-1)=8 4(5x - 1) = 8 * 7 5x - 1 = 56/4 5x = 14 + 1 x = 15/5 x = 3|||||q1 3x=-21 X=-7 q2. 30=5y y=6 q3. y=-4.2 q4. (p-6)=9 P=15 q5. 九分之x=2 X=18 q6. (4x+11)=-5 4x=-26 X=4 q7. 0.4n=1.2 n=3 q8. 13分之6y=24 y=52 q9. (5x-1)=14 5X=15 X=34E350C6F8B48ECA2