（1）原式=0.25×4×4.78

                =1×4.78

                = 4.78（2）原式=1.5×（100+5）

                =150+7.5

                =157.5

（3）原式=2.07×2.8

                =5.796

 （4）原式=2.3+3.91÷2.3

                =2.3+1.7

                = 4

（5）原式=（2.65+1.35）×1.7

                = 4×1.7

                =6.8（6）原式=0.01032+0.875

                =0.88532

（7）原式=0.5×2×（1.25×0.8）

                =1×1

                =1（8）原式=（10-1.35）×1.2-0.9

                =10.38-0.9

                =9.48