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升中一maths~~~(方程式)10點!!!}}}
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最佳解答:
題目1: 3(x+2)=27 x+3=27/3 x+3=9 x=9-3 x=6 題目2: (4s-s)+4=28 4s-s=28-4 3s=24 s=24/3 s=8 題目3: 6(5+4m)=78 5+4m=78/6 5+4m=13 4m=13-5 4m=8 m=2 題目4: 4t-6=4-t 4t+t-6=4 5t=6+4 5t=10 t=2 題目5: 4(u+5)+2(u-5)=70 4u+20+2(u-5)=70 4u+20+2u-10=70 6u+10=70 6u=60 u=10 題目6: 2w+w/4=45 2w*4+w/4*4=45*4 2w+w=180 3w=180 w=60 題目7: y+3/4y+70=280 4y(y+3/4y+70)=4y(280) 4y^2+3+280y=1120y 4y^2+280y-1117=0 y=3.78 或 -73.8 <----(由算數計 計出) 以上的計算過是比較長細 因此,你可以簡化以上過程. 2009-08-28 13:35:27 補充： 第7題我計錯左=-= 正確的是: y+3/4y+70=280 y+3/4y=210 7/4y=210 y=210(4/7) y=120
其他解答:
1.3(x+2)=27 x+2=9 x=7 2.(4s-s)+4=28 3s=24 s=6 3.6(5+4m)=78 5+4m=13 4m=8 m=2 4.4t-6=4-t 5t=10 t=2 5.4(u+5)+2(u-5)=70 4u+20+2u-10=70 6u=60 u=10 6.2w+w/4=45 2w=(180-w)/4 8w=180-w 9w=180 w=20 7.y+3/4y+70=280 y+3/4y=210 7/4y=210 y=210(4/7) y=120|||||1.3(x+2)=27 3x+6=27 3x=21 x=7 2.(4s-s)+4=28 (3s)+4=28 3s=24 s=8 3.6(5+4m)=78 30+24m=78 24m=48 m=2 4. 4t-6=4-t 5t-6=4 5t=10 t=2 5. 4(u+5)+2(u-5)=70 4u+20+2u-10=70 6u+10=70 6u=60 u=10 6. 2w+w/4=45 2 1/4w(二又四分一w)=45 w=45x 4/9 w=20 7.y+3/4y+70=280 1 3/4y +70=280 1 3/4y=210 y=120|||||1. 3(x+2)= 27 x+2 = 9 x= 7 2. (4s-s)+4= 28 3s+4 = 28 3s = 24 s = 8 3. 6(5+4m)= 78 5+4m = 13 4m = 8 m = 2 4. 4t-6= 4-t 4t+t = 4+6 5t = 10 t = 2 5. 4(u+5)+2(u-5)= 70 4u+20+2u-10 = 70 6u+10 = 70 6u = 60 u = 10 6. 2w+w/4= 45 (2w+w/4)*4 = 45*4 8w+w = 180 9w = 180 w = 20 7. y+3/4y+70= 280 y+3/4y = 210 (y+3/4y)*4 = 210*4 4y+3y = 840 7y = 840 y= 120|||||1. 3(x+2)=27 3x + 6 = 27 3x = 27 -6 3x = 21 x = 7 2. (4s-s)+4=28 3s + 4 = 28 3s = 28 - 4 3s = 24 s = 8 3. 6(5+4m)=78 30 + 24m = 78 24m = 78 - 30 24m = 48 m = 2 4. 4t-6=4-t 4t + t = 4 + 6 5t = 10 t = 2 5. 4(u+5)+2(u-5)=70 4u + 20 + 2u - 10 = 70 6u + 10 = 70 6u = 70 - 10 6u = 60 u = 10 6. 2w+w/4=45 4(2w+w/4) = 45 x 4 8w + w = 180 9w = 180 w = 20 7. y+3/4y+70=280 y+3/4y = 280 - 70 y+3/4y = 210 4(y+3/4y) = 210 x 4 4y + 3y = 840 7y = 840 y = 120
升中一maths~~~(方程式)10點!!!}}}
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此文章來自奇摩知識+如有不便請留言告知
1.3(x+2)=27 = = =2.(4s-s)+4=28 = = =3.6(5+4m)=78 = = =4.4t-6=4-t = = =5.4(u+5)+2(u-5)=70 = = =6.2w+w/4=45 = = ... 顯示更多 1.3(x+2)=27 = = = 2.(4s-s)+4=28 = = = 3.6(5+4m)=78 = = = 4.4t-6=4-t = = = 5.4(u+5)+2(u-5)=70 = = = 6.2w+w/4=45 = = = 7.y+3/4y+70=280 = = =最佳解答:
題目1: 3(x+2)=27 x+3=27/3 x+3=9 x=9-3 x=6 題目2: (4s-s)+4=28 4s-s=28-4 3s=24 s=24/3 s=8 題目3: 6(5+4m)=78 5+4m=78/6 5+4m=13 4m=13-5 4m=8 m=2 題目4: 4t-6=4-t 4t+t-6=4 5t=6+4 5t=10 t=2 題目5: 4(u+5)+2(u-5)=70 4u+20+2(u-5)=70 4u+20+2u-10=70 6u+10=70 6u=60 u=10 題目6: 2w+w/4=45 2w*4+w/4*4=45*4 2w+w=180 3w=180 w=60 題目7: y+3/4y+70=280 4y(y+3/4y+70)=4y(280) 4y^2+3+280y=1120y 4y^2+280y-1117=0 y=3.78 或 -73.8 <----(由算數計 計出) 以上的計算過是比較長細 因此,你可以簡化以上過程. 2009-08-28 13:35:27 補充： 第7題我計錯左=-= 正確的是: y+3/4y+70=280 y+3/4y=210 7/4y=210 y=210(4/7) y=120
其他解答:
1.3(x+2)=27 x+2=9 x=7 2.(4s-s)+4=28 3s=24 s=6 3.6(5+4m)=78 5+4m=13 4m=8 m=2 4.4t-6=4-t 5t=10 t=2 5.4(u+5)+2(u-5)=70 4u+20+2u-10=70 6u=60 u=10 6.2w+w/4=45 2w=(180-w)/4 8w=180-w 9w=180 w=20 7.y+3/4y+70=280 y+3/4y=210 7/4y=210 y=210(4/7) y=120|||||1.3(x+2)=27 3x+6=27 3x=21 x=7 2.(4s-s)+4=28 (3s)+4=28 3s=24 s=8 3.6(5+4m)=78 30+24m=78 24m=48 m=2 4. 4t-6=4-t 5t-6=4 5t=10 t=2 5. 4(u+5)+2(u-5)=70 4u+20+2u-10=70 6u+10=70 6u=60 u=10 6. 2w+w/4=45 2 1/4w(二又四分一w)=45 w=45x 4/9 w=20 7.y+3/4y+70=280 1 3/4y +70=280 1 3/4y=210 y=120|||||1. 3(x+2)= 27 x+2 = 9 x= 7 2. (4s-s)+4= 28 3s+4 = 28 3s = 24 s = 8 3. 6(5+4m)= 78 5+4m = 13 4m = 8 m = 2 4. 4t-6= 4-t 4t+t = 4+6 5t = 10 t = 2 5. 4(u+5)+2(u-5)= 70 4u+20+2u-10 = 70 6u+10 = 70 6u = 60 u = 10 6. 2w+w/4= 45 (2w+w/4)*4 = 45*4 8w+w = 180 9w = 180 w = 20 7. y+3/4y+70= 280 y+3/4y = 210 (y+3/4y)*4 = 210*4 4y+3y = 840 7y = 840 y= 120|||||1. 3(x+2)=27 3x + 6 = 27 3x = 27 -6 3x = 21 x = 7 2. (4s-s)+4=28 3s + 4 = 28 3s = 28 - 4 3s = 24 s = 8 3. 6(5+4m)=78 30 + 24m = 78 24m = 78 - 30 24m = 48 m = 2 4. 4t-6=4-t 4t + t = 4 + 6 5t = 10 t = 2 5. 4(u+5)+2(u-5)=70 4u + 20 + 2u - 10 = 70 6u + 10 = 70 6u = 70 - 10 6u = 60 u = 10 6. 2w+w/4=45 4(2w+w/4) = 45 x 4 8w + w = 180 9w = 180 w = 20 7. y+3/4y+70=280 y+3/4y = 280 - 70 y+3/4y = 210 4(y+3/4y) = 210 x 4 4y + 3y = 840 7y = 840 y = 120
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