问题
解答题
脱式计算,能简算的要简算. (1)0.95×
(2)
(3)10000÷25÷8÷4 (4)
|
答案
(1)0.95×
+2 7
×0.95,5 7
=0.95×(
+2 7
),5 7
=0.95;
(2)
-5 19
-13 17
+4 17
,14 19
=(
+5 19
)-(14 19
+13 17
),4 17
=1-1,
=0;
(3)10000÷25÷8÷4,
=10000÷(25×8×4),
=10000÷800,
=12.5;
(4)
+5 9
-1.625-2.375+3,7 9
=(
+5 9
+3)-(1.625+2.375),7 9
=4
-4,1 3
=
.1 3