题目

计算下面各题,能简算的要简算。 (1) 3.09×99+3.09 (2) [7.35-(3.6-2.65)]×0.7 (3) 2.5× 1.25 ×0.4×8 (4) 83.7-45.3÷15 答案: 3.09×99+3.09 =3.09×(99+1) =3.09×100 =309 [7.35-(3.6-2.65)]×0.7 =[7.35-0.95]×0.7 =6.4×0.7 =4.48 2.5× 1.25 ×0.4×8 =(2.5×0.4)×(1.25×8) =1×10 =10 83.7-45.3÷15 =83.7-3.02 =80.68
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