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