问题
解答题
脱式计算(能用简便方法的用简便方法计算) [(
61
23-
5.8×99-4.2 10.6-(6.3+0.125÷12.5%) |
答案
(1)[(
-7 16
)+1 4
]÷15 16
,1 2
=[
+3 16
]÷15 16
,1 2
=
÷18 16
,1 2
=2.25;
(2)61
-15.37+383 4
-34.63,1 4
=(61
+383 4
)-(15.37+34.63),1 4
=100-50,
=50;
(3)23-
×8 9
÷3 8
,1 27
=23-
÷3 9
,1 27
=23-9,
=14;
(4)5.8×99-4.2,
=5.8×(100-1)-4.2,
=580-5.8-4.2,
=580-(5.8+4.2),
=580-10,
=570;
(5)10.6-(6.3+0.125÷12.5%),
=10.6-(6.3+1),
=10.6-7.3,
=3.3.