题目

脱式计算(能简算的要简算) (1) 8.6-1.65×4 (2) 3.5×0.6-2.8×0.6 (3) (4+0.4)×2.5 (4) 8.23×10.1 答案: 8.6-1.65×4 =8.6-6.6 =2 3.5×0.6-2.8×0.6 =(3.5-2.8)×0.6 =0.42 (4+0.4)×2.5 =4×2.5+0.4×2.5 =11 8.23×10.1 =8.23×10+8.23×0.1 =83.123
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