不等式组1.2x-1>0x+1<32.-3x-1>32x+1>33.3(x-1)+13>5x-2(5-x)5-(2x+1)<3-6x4.x-3(x-2)≥4(1+2x)/3>x-15.x-3(x-2)≥4(2x-1)/5>(x+1)/26.1/2(x+4)<2(x+2)/2>(x+3)/3第二题::总结解一元一次不等式组的
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/30 16:45:57
![不等式组1.2x-1>0x+1<32.-3x-1>32x+1>33.3(x-1)+13>5x-2(5-x)5-(2x+1)<3-6x4.x-3(x-2)≥4(1+2x)/3>x-15.x-3(x-2)≥4(2x-1)/5>(x+1)/26.1/2(x+4)<2(x+2)/2>(x+3)/3第二题::总结解一元一次不等式组的](/uploads/image/z/1050033-57-3.jpg?t=%E4%B8%8D%E7%AD%89%E5%BC%8F%E7%BB%841.2x-1%EF%BC%9E0x%2B1%EF%BC%9C32.-3x-1%EF%BC%9E32x%2B1%EF%BC%9E33.3%EF%BC%88x-1%29%2B13%EF%BC%9E5x-2%285-x%295-%EF%BC%882x%2B1%29%EF%BC%9C3-6x4.x-3%28x-2%29%E2%89%A54%EF%BC%881%2B2x%EF%BC%89%2F3%EF%BC%9Ex-15.x-3%28x-2%29%E2%89%A54%EF%BC%882x-1%EF%BC%89%2F5%EF%BC%9E%EF%BC%88x%2B1%EF%BC%89%2F26.1%2F2%28x%2B4%29%EF%BC%9C2%EF%BC%88x%2B2%29%2F2%EF%BC%9E%EF%BC%88x%2B3%29%2F3%E7%AC%AC%E4%BA%8C%E9%A2%98%EF%BC%9A%EF%BC%9A%E6%80%BB%E7%BB%93%E8%A7%A3%E4%B8%80%E5%85%83%E4%B8%80%E6%AC%A1%E4%B8%8D%E7%AD%89%E5%BC%8F%E7%BB%84%E7%9A%84)
不等式组1.2x-1>0x+1<32.-3x-1>32x+1>33.3(x-1)+13>5x-2(5-x)5-(2x+1)<3-6x4.x-3(x-2)≥4(1+2x)/3>x-15.x-3(x-2)≥4(2x-1)/5>(x+1)/26.1/2(x+4)<2(x+2)/2>(x+3)/3第二题::总结解一元一次不等式组的
不等式组
1.
2x-1>0
x+1<3
2.
-3x-1>3
2x+1>3
3.
3(x-1)+13>5x-2(5-x)
5-(2x+1)<3-6x
4.
x-3(x-2)≥4
(1+2x)/3>x-1
5.
x-3(x-2)≥4
(2x-1)/5>(x+1)/2
6.1/2(x+4)<2
(x+2)/2>(x+3)/3
第二题:
:总结解一元一次不等式组的一般步骤,并与解一元一次
不等式进行比较
不等式组1.2x-1>0x+1<32.-3x-1>32x+1>33.3(x-1)+13>5x-2(5-x)5-(2x+1)<3-6x4.x-3(x-2)≥4(1+2x)/3>x-15.x-3(x-2)≥4(2x-1)/5>(x+1)/26.1/2(x+4)<2(x+2)/2>(x+3)/3第二题::总结解一元一次不等式组的
1.2x-1>0 2x>1 x>0.5
x+1<3 x<2 ∴0.5<x<2
2.-3x-1>3 -3x>4 x<-4/3
2x+1>3 2x >2 x>1 所以原不等式组,无解
3.3(x-1)+13>5x-2(5-x) 3x-10>5x-10+2x -4x>0 x<0
5-(2x+1)<3-6x 5-2x-1<3-6x 4x<-1 x<-1/4 ∴ x<-1/4
4.x-3(x-2)≥4 x-3x+6≥4 -2x≥-2 x≤1
(1+2x)/3>x-1 1+2x>3x-3 -x>-4 x< 4 ∴ x≤1
5.x-3(x-2)≥4 x≤1
(2x-1)/5>(x+1)/2 4x-2>5x+5 -x>7 x<-7 ∴x<-7
6.1/2(x+4)<2 x+4<4 x<0
(x+2)/2>(x+3)/3 3x+6>2x+6 x>0 ∴无解
归纳:一般步骤与解一元一次方程一样,但当两边同时乘除一个负数时,不等号的方向改变,当大于大的小于小的就无∴同大取大,同小取小,大小小大取中间,大大小小无解 (自己领悟)
已经回答的很好了
1∴0.5<x<2
2无解
3x<-1/4
4x≤1
5x<-7
6无解
同大取大,同小取小,大小小大取中间,大大小小无解