数学题(1.5x0.6+0.6x0.8+1.5x0.8)x2用简
(1.5x0.6+0.6x0.8+1.5x0.8)x2用简便方法计算
3*0.6+1.6*0.6+3*0.8 =1.8+0.96+2.4 =5.16