怎么简便怎么算 (5.9+1.65)÷0.25 4÷(4/7+4/5) 0.6÷[3/8÷(4/15+2/15)] 7/29×3/8+6/29×7/12+3/29×7/9.
问题描述:
怎么简便怎么算
(5.9+1.65)÷0.25
4÷(
+4 7
)4 5
0.6÷[
÷(3 8
+4 15
)]2 15
×7 29
+3 8
×6 29
+7 12
×3 29
. 7 9
答
(1)(5.9+1.65)÷0.25,=7.55÷0.25,=30.2;(2)4÷(47+45),=4÷(2035+2835),=4÷4835,=4×3548,=3512;(3)729×38+629×712+329×79,=729×38+729×612+729×39,=(38+12+13)×729,=(924+1224+...