
计算下列各题,能简便的要简便(1)4×37+3×59-5×37+1×49+1×47(2)2008×20062007(3)2-613÷926-2
计算下列各题,能简便的要简便(1)4×37+3×59-5×37+1×49+1×47(2)2008×20062007(3)2-613÷926-23(4)0.25×1.25×...
计算下列各题,能简便的要简便(1)4×37+3×59-5×37+1×49+1×47(2)2008×20062007(3)2-613÷926-23(4)0.25×1.25×320(5)0.6×47+52×35+0.6(6)9.75+99.75+999.75+9999.75.
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(1)4×
+3×
-5×
+1×
+1×
=1×
+4×
-5×
+3×
+1×
=
-(5-4)×
+
+
=
-
+2
=
+2
=2
;
(2)2008×
=(2007+1)×
=2007×
+
=2006+
=2006
;
(3)2-
÷
-
=2-
-<
3 |
7 |
5 |
9 |
3 |
7 |
4 |
9 |
4 |
7 |
=1×
4 |
7 |
3 |
7 |
3 |
7 |
5 |
9 |
4 |
9 |
=
4 |
7 |
3 |
7 |
15 |
9 |
4 |
9 |
=
4 |
7 |
3 |
7 |
1 |
9 |
=
1 |
7 |
1 |
9 |
=2
16 |
63 |
(2)2008×
2006 |
2007 |
=(2007+1)×
2006 |
2007 |
=2007×
2006 |
2007 |
2006 |
2007 |
=2006+
2006 |
2007 |
=2006
2006 |
2007 |
(3)2-
6 |
13 |
9 |
26 |
2 |
3 |
=2-
4 |
3 |
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