问题
解答题
计算下列各题.
|
答案
860-560÷8×7
=860-70×7,
=860-490,
=370;
(5.9+1.65)÷2.5
=7.55÷2.5,
=3.02;
(
+3 4
)×20÷4 5 31 21
=(
×20+3 4
×20)÷4 5
,31 21
=(15+16)×
,21 31
=31×
,21 31
=21;
÷[(3 5
+7 9
)×1 3
].3 2
=
÷[3 5
×10 9
],3 2
=
÷3 5
,5 3
=
.9 25