问题
解答题
计算下列各题:
|
答案
①17.09-3.63-6.37+0.91,
=(17.09+0.91)-(3.63+6.37),
=18-10,
=8;
②10÷[
-(8 3
÷5 13
+5 26
)]2 5
=10÷[
-(8 3
×5 13
+26 5
)]2 5
=10÷[
-8 3
]12 5
=10÷[
-40 15
]36 15
=10÷4 15
=10×15 4
=37.5;
③198÷
+202×4 3
,3 4
=198×
+202×3 4
,3 4
=
×(198+202),3 4
=300;
④
×[1÷(7 8
-7 10
)]7 20
=
×[1÷7 8
]7 20
=
×7 8 20 7
=2.5;