(1)1.25×8.37×0.8 =1.25×0.8×8.37, =1×8.37, =8.37; (2)(9-2.35)×0.64 =6.65×0.64, =4.256; (3)0.25×32×12.5 =(0.25×4)×(8×1.25), =1×10, =10; (4)0.15×1999+0.15 =(1+1999)×0.15, =2000×0.15, =300; (5)0.37×1.4-0.4×0.37 =(1.4-0.4)×0.37, =1×0.37, =0.37; (6)8.7×9.9 =8.7×(10-0.1), =8.7×10-8.7×0.1, =87-0.87, =86.13. |