计算下面各题(怎样简便怎样算): 18.3-7.4-2.6 1-8/15÷4/5+2/3 (4×0.25-3/5)÷4/5 0.75×16+3/4×5-75%
问题描述:
计算下面各题(怎样简便怎样算):
18.3-7.4-2.6
1-
÷8 15
+4 5
2 3
(4×0.25-
)÷3 5
4 5
0.75×16+
×5-75% 3 4
答
(1)18.3-7.4-2.6=18.3-(7.4+2.6)=18.3-10=8.3;(2)1-815÷45+23=1-23+23=13+23=1;(3)(4×0.25-35)÷45=(1-35)÷45=25÷45=12;(4)0.75×16+34×5-75%=0.75×16+0.75×5-0.75=0.75×(16+5-1)=0.75×...