问题 计算题
脱式计算。(能简算的要简算)
(1)3.45 ×0.6×2.8(2)19.12-3.6×3 (3)0.46 ×0.22+ 1.875
(4)0. 28 ×202(5)3.12×2.4+1.88×2.4 (6)32.5 ×(8.2 -6.56)
答案

(1)原式=2.07×2.8=5.769 (2)原式=19.12-10.8=8.32(3)原式=0.1012+1.875=1.9762

(4)原式=0.28×(200+2)

                =0.28×200+0.28×2 

               =56+0.56 

               =56.56 (5)原式=(3.12+1.88)×2.4 

               =5×2.4 

               =12

(6)原式= 32.5×8.2-32.5×6.56 

               =32.5×(8+0.2)-213.2 

               =260+6.5-213.2 

               =53.3

单项选择题
单项选择题