题目
计算下列各题,能简便的要用简便方法算。
(1)
2.1÷0.25
(2)
3.7×5.4+4.6×3.7
(3)
2.84×0.5÷7.1
(4)
(8.5-3.4÷1.7)÷0.13
答案: 2.1÷0.25 =(2.1×4)÷(0.25×4) =8.4÷1 =8.4
3.7×5.4+4.6×3.7 =3.7×(5.4+4.6) =3.7×10 =37
2.84×0.5÷7.1 =1.42÷7.1 =0.2
(8.5-3.4÷1.7)÷0.13 =(8.5-2)÷0.13 =6.5÷0.13 =50