解:X-0.7=3.6 (1-0.7)x=3.6 0.3x=3.6 x=12
(1-0.7)X=3.60.3X=3.6X=3.6\0.3X=12
(1-0.7)X=3.60.3x=3.6X=12
X-0.7X=3.60.3X=3.6x=12
X-0.7X=3.6x=12