1a.2(7x-(x+3)=5x+22
1b.9(2(x+30-)11)=5(x+4)
請列算.....
中學數學......THX
2008-02-15 11:57 pm
回答 (2)
2008-02-16 12:06 am
✔ 最佳答案
1a) 2(7x-(x+3)=5x+222(7x-x-3) =5x+22
2(6x-3) = 5x+22
12x-6 =5x+22
7x =28
x =4
1b) 9(2(x+30-)11)=5(x+4)
9[2x+60-11] =5x+20
18x+540-99=5x+20
13x =-421
x = -421/13
你睇下你1b 條式有冇打錯 -.-
2008-02-16 12:12 am
1a. 2(7x-x-3)=5x+22
2(6x-3)=5x+22
12x-5x=22+6
7x=28
x=4
1b. 9(2x+60-11)=5x+20
18x+49x9=5x+20
18x+441=5x+20
18x-5x=20-441
13x=-421
x=32又13分之5
2(6x-3)=5x+22
12x-5x=22+6
7x=28
x=4
1b. 9(2x+60-11)=5x+20
18x+49x9=5x+20
18x+441=5x+20
18x-5x=20-441
13x=-421
x=32又13分之5
參考: 最後打不到.sorry
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