题目内容
巧计算。
(1)2.9+29.9+299.9+2999.9+29999.9
(1)2.9+29.9+299.9+2999.9+29999.9
(2)
×
+
×
+
×
(1)原式=(3-0.1)+(30-0.1)+(300-0.1)+(3000-0.1)+(30000-0.1)
=33333-0.5
=33332.5
=33333-0.5
=33332.5
(2)原式=
×
+
×
+
×
=
×(
+
+
)
=
×
=
=
=
=
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