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解:1) (3+3/1)*10.8=x+3.62) (1/2)x+(1/3)x+600=x3) x+2=6/1.24) x/4+(x-x/4)(3/5)+x/5=x-505) 兄弟年後之和是20歲，4年前，兄年是弟年的2倍，問兄弟今年各幾歲？6) 乙比甲大32歲，6年後，甲年是乙年的5倍，求甲乙今年各幾歲？7) 4(x/2-3)=x-48) (b)(b)=(b+2)(b-1)9) (((c/2+1)/2+1)/2-1)=110) 100(9-x+3)+0+(x-3)=100x+0+(9-x)11)... 顯示更多 解: 1) (3+3/1)*10.8=x+3.6 2) (1/2)x+(1/3)x+600=x 3) x+2=6/1.2 4) x/4+(x-x/4)(3/5)+x/5=x-50 5) 兄弟年後之和是20歲，4年前，兄年是弟年的2倍，問兄弟今年各幾歲？ 6) 乙比甲大32歲，6年後，甲年是乙年的5倍，求甲乙今年各幾歲？ 7) 4(x/2-3)=x-4 8) (b)(b)=(b+2)(b-1) 9) (((c/2+1)/2+1)/2-1)=1 10) 100(9-x+3)+0+(x-3)=100x+0+(9-x) 11) 15.6x13.04(3.75-x)=55.3 12) x+(5x+1)+(25x+6)=999 13) x=5(x+5)-5(x-5) 14) (5000+y)(20+x)=125150 終極難題:) x-(1/2+20000)-(3/4(x-(1/2x=20000)-10000)=205000 更新: (1abcde)3=abcde1 更新 2: 要步驟!!

最佳解答:

解:1) (3+3/1)*10.8=x+3.6A. (3+ 3/1)*10.8 = x+6 or (3+3 /1)*10.8 = x+6(6)*10.8 = x+6x = 64.8-6x = 58.82) (1/2)x+(1/3)x+600=xA. (1/2)x+(1/3)x+600 = x600 = x(6-3-2)/ 6x/ 6 = 600x = 36003) x+2=6/1.2A. x+2 = 6/1.2x = 5-2x = 34) x/4+(x-x/4)(3/5)+x/5=x-50A. x/4 + (x- x/4)(3/5) + x/5 = x-5020 (x/4 + (3x/4)(3/5) + x/5) = 20(x-50)5x+9x+4x = 20x-10002x = 1000x = 5005) 兄弟年後之和是20歲，4年前，兄年是弟年的2倍，問兄弟今年各幾歲？A. 設兄弟今年各x, y歲.x+y = 20x-4 = 2(y-4)x = 2y-4So, 2y-4+y = 203y = 24y = 8所以, 兄弟今年各(20-8) = 12歲, 8歲6) 乙比甲大32歲，6年後，甲年是乙年的5倍，求甲乙今年各幾歲？A. 設甲乙今年各x, y歲.y-32 = xy+6 = 5(x+6)y = 5x+24So, 5x+24-32 = x4x = 8x = 2所以, 甲乙今年各2, (2+32) = 34歲.7) 4(x/2-3)=x-4A. 4(x/2 -3) = x-4x = -4+12x = 88) (b)(b)=(b+2)(b-1)A. (b)(b) = (b+2)(b-1)b^2 = b^2+b-2b = 29) (((c/2+1)/2+1)/2-1)=1A. ((c/2+1)/2+1)/2-1 = 1(c/2 +1)/2 +1 = 4c/2 = 5c = 1010) 100(9-x+3)+0+(x-3)=100x+0+(9-x)A. 100(9-x+3)+0+(x-3) = 100x+0+(9-x)1200-100x+x-3 = 100x+9-x1002x = 12x = 2/16711) 15.6x13.04(3.75-x)=55.3A. I can’t get your meaning...12) x+(5x+1)+(25x+6)=999A. x+(5x+1)+(25x+6) = 99931x = 992x = 3213) x=5(x+5)-5(x-5)A. x = 5(x+5)-5(x-5)x = 5(x+5-x+5)x = 5014) (5000+y)(20+x)=125150A. (5000+y)(20+x) = 125150100000+5000x+20y+xy = 1251505000x+20y+xy = 25150Actually, two variables with one equation is unable to be solved.終極難題:)x-(1/2+20000)-(3/4(x-(1/2x=20000)-10000)=205000 A. x-(1/2+20000)-(3/4(x-(1/2x#### = ####20000)-10000) = 205000In “## ##”, it shouldn’t be “=”. What is that?(1abcde)3=abcde1 A. Let abcde be x.(1x)3 = 1x3x = xx = 0abcde = 0要步驟!! 2010-10-17 01:27:26 補充： 解: 1) (3+3/1)*10.8=x+3.6 A. (3+ 3/1)*10.8 = x+6 or (3+3 /1)*10.8 = x+6 (6)*10.8 = x+6 x = 64.8-6 x = 58.8 2) (1/2)x+(1/3)x+600=x A. (1/2)x+(1/3)x+600 = x 600 = x(6-3-2)/ 6 x/ 6 = 600 x = 3600 3) x+2=6/1.2 A. x+2 = 6/1.2 x = 5-2 x = 3 2010-10-17 01:28:28 補充： 4) x/4+(x-x/4)(3/5)+x/5=x-50 A. x/4 + (x- x/4)(3/5) + x/5 = x-50 20 (x/4 + (3x/4)(3/5) + x/5) = 20(x-50) 5x+9x+4x = 20x-1000 2x = 1000 x = 500 5) 兄弟年後之和是20歲，4年前，兄年是弟年的2倍，問兄弟今年各幾歲？ A. 設兄弟今年各x, y歲. x+y = 20 x-4 = 2(y-4) x = 2y-4 So, 2y-4+y = 20 3y = 24 y = 8 所以, 兄弟今年各(20-8) = 12歲, 8歲 2010-10-17 01:28:38 補充： 6) 乙比甲大32歲，6年後，甲年是乙年的5倍，求甲乙今年各幾歲？ A. 設甲乙今年各x, y歲. y-32 = x y+6 = 5(x+6) y = 5x+24 So, 5x+24-32 = x 4x = 8 x = 2 所以, 甲乙今年各2, (2+32) = 34歲. 7) 4(x/2-3)=x-4 A. 4(x/2 -3) = x-4 x = -4+12 x = 8 8) (b)(b)=(b+2)(b-1) A. (b)(b) = (b+2)(b-1) b^2 = b^2+b-2 b = 2 2010-10-17 01:28:48 補充： 9) (((c/2+1)/2+1)/2-1)=1 A. ((c/2+1)/2+1)/2-1 = 1 (c/2 +1)/2 +1 = 4 c/2 = 5 c = 10 10) 100(9-x+3)+0+(x-3)=100x+0+(9-x) A. 100(9-x+3)+0+(x-3) = 100x+0+(9-x) 1200-100x+x-3 = 100x+9-x 1002x = 12 x = 2/167 11) 15.6x13.04(3.75-x)=55.3 A. I can’t get your meaning... 2010-10-17 01:29:03 補充： 12) x+(5x+1)+(25x+6)=999 A. x+(5x+1)+(25x+6) = 999 31x = 992 x = 32 13) x=5(x+5)-5(x-5) A. x = 5(x+5)-5(x-5) x = 5(x+5-x+5) x = 50 14) (5000+y)(20+x)=125150 A. (5000+y)(20+x) = 125150 100000+5000x+20y+xy = 125150 5000x+20y+xy = 25150 Actually, two variables with one equation is unable to be solved. 2010-10-17 01:29:10 補充： 終極難題:) x-(1/2+20000)-(3/4(x-(1/2x=20000)-10000)=205000 A. x-(1/2+20000)-(3/4(x-(1/2x#### = ####20000)-10000) = 205000 In “## ##”, it shouldn’t be “=”. What is that? (1abcde)3=abcde1 A. Let abcde be x. (1x)3 = 1x 3x = x x = 0 abcde = 0 要步驟!!

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