0.2*(3X-5)+3=0.4*(X-2)+4
4个回答
0.2*(3X-5)+3=0.4*(X-2)+4
0.6x-1+3=0.4x-0.8+4
0.6x-0.4x=4-0.8+1-3
0.2x=1.2
x=1.2÷0.2
x=6
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2-4X———— >0 5+3X答:两边乘(3x+5)²>0所以(2-4x)(3x+5)>0两边除以-2(2x-1)(3
x1+x2+2x3-x4=0 { -x-3x3+2x4=0 2x1+x2+5x2-3x4=0 的一般解
x-3/0.4-x 2/0.5=2.5