=51*（93+1+2）=51*（100-4）=5100-204 = 4896； =5/2 * 1/8 *320=5*20=100； =5.9*（7+1+2）=59； =126*（28+64+11）+79*（96+7）=126*103+79*103=103*（126+79）=（100+3）*205=20500+615=21115 =2.5*40*0.876=100*0.876=87.6 =（0.1+1）+（0.2+0.9）+……=1.1*5=5.5 =789*2*50=789*100=78900 =64.2*（87+13）=6420 =1000+999+999*999=1000+999*（999+1）=1000000 =（84.67-14.67）-15.3=70-15.3= 54.7 =1024-（281+219）=1024-500=524 =0.035*（935+1+3）+（0.07*0.5）*61=0.035*939+0.035*61=0.035*（939+61）=35