脱式计算(第1和第2小题用简便方法计算)(1)14.5×64+64×4.5(2)2.5×32×12.5(3)(45+14)÷73
脱式计算(第1和第2小题用简便方法计算)(1)14.5×64+64×4.5(2)2.5×32×12.5(3)(45+14)÷73+710(4)168.1÷(4.3×2-0...
脱式计算(第1和第2小题用简便方法计算)(1)14.5×64+64×4.5(2)2.5×32×12.5(3)(45+14)÷73+710(4)168.1÷(4.3×2-0.4)
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①14.5×64+64×4.5,
=(14.5+4.5)×64,
=19×64,
=1216;
②2.5×32×12.5,
=2.5×(4×8)×12.5,
=(2.5×4)×(8×12.5),
=10×100,
=1000;
③(
+
)÷
+
,
=
×
+
,
=
+
,
=1
;
④168.1÷(4.3×2-0.4),
=168.1÷(8.6-0.4),
=168.1÷8.2,
=20.5;
=(14.5+4.5)×64,
=19×64,
=1216;
②2.5×32×12.5,
=2.5×(4×8)×12.5,
=(2.5×4)×(8×12.5),
=10×100,
=1000;
③(
4 |
5 |
1 |
4 |
7 |
3 |
7 |
10 |
=
21 |
20 |
3 |
7 |
7 |
10 |
=
9 |
20 |
14 |
20 |
=1
3 |
20 |
④168.1÷(4.3×2-0.4),
=168.1÷(8.6-0.4),
=168.1÷8.2,
=20.5;
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