问题
解答题
用简便方法算. (1)98700÷25÷4 (2)0.38×
(3)15.78-(
|
答案
(1)98700÷25÷4,
=98700÷(25×4),
=98700÷100,
=987;
(2)0.38×
+0.4×0.38,3 5
=0.38×0.6+0.4×0.38,
=0.38×(0.6+0.4),
=0.38×1,
=0.38;
(3)15.78-(
+5.78 ),7 9
=15.78-5.78-
,7 9
=10-
,7 9
=9
.2 9