当x取何值时 式子1/2[2x-1/3*(10-70)]-x/2的值比式子1/3[x-1/2(x+1)]的值小3?
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解决时间 2021-12-25 00:06
- 提问者网友:自食苦果
- 2021-12-24 01:14
当x取何值时 式子1/2[2x-1/3*(10-70)]-x/2的值比式子1/3[x-1/2(x+1)]的值小3?
最佳答案
- 五星知识达人网友:独钓一江月
- 2021-12-24 02:16
1/2[2x-1/3*(10-70)]-x/2 1/3[x-1/2(x+1)
=1/2(2x-10/3+70/3)-1/2x =1/3(x-1/2x-1/2)
=1/2(2x+20) =1/3x-1/6x-1/6
=x+10 =1/6x-1/6
x+10-1/6x-1/6=3
5/6x =77/6*6/5
x =77/5
=1/2(2x-10/3+70/3)-1/2x =1/3(x-1/2x-1/2)
=1/2(2x+20) =1/3x-1/6x-1/6
=x+10 =1/6x-1/6
x+10-1/6x-1/6=3
5/6x =77/6*6/5
x =77/5
全部回答
- 1楼网友:持酒劝斜阳
- 2021-12-24 02:47
解:由题意(1/2)[2x - (1/3)(10 - 70)] - x/2 = (1/3)[x - (1/2)(x + 1)] - 3,即(1/2)(2x + 20) - x/2 = (1/3)(x/2 - 1/2) - 3,即x + 10 - x/2 = x/6 - 1/6 - 3,移项可得x/3 = -79/6,因此x = -79/2 ;
综上所述,所求x = -79/2 。
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