四点6×5点2+4点8×5点四的简便计算四点6×5点2+4点8×5点四=4.6*（5.4-0.2）+（4.6+0.2）*5.4=4.6*5.4-4.6*0.2+4.6*5.4+0.2*5.4=49.68+1.6=51.28
