x 2.1x 多少

x+2.1x=0.7753.1x=0.775x=0.775÷3.1x=0.25

解: 问题不道明确,只能分别回答:1、 如果是内 x * 2.1x=2.79, 则得 2.1x=2.79x≈1.42x≈±容1.192、 如果是 x+2.1x=2.79, 则得 3.1x=2.79x=0.93、 如果是 x-2.1x=2.79, 则得 1.1x=2.79x≈2.54

x+2.1x=1.553.1x=1.55x=1.55/3.1x=0.5

|x|=7x1=7 2.1x=14.7x2=-7 2.1x=-14.7

x*1.8-0.6=2.1x*1.8=2.1+0.6x*1.8=2.7x=2.7÷1.8x=1.5

原式等于X(1+2.1)=1.55 所以X=0.5

x ?2.1x=1.55第一个x后面是什么符号

12.6

x+2.1x=1.55X=0.5

1.85x=2.1x 1.85x-2.1x=0 (1.85-2.1)x=0 -0.25x=0 x=0