0.27乘5.6加()乘5.6加5.6乘025=0.78乘0.56

问题描述:

0.27乘5.6加()乘5.6加5.6乘025=0.78乘0.56
5.6乘0.25 没学过x,也没学过负数,

设那数为X
0.27*5.6+5.6X+5.6*0.25=0.78*0.56
5.6*(0.27+X+0.25)=0.078*5.6
0.52+X=0.078
X=-0.442