题目内容

脱式计算.(能简算的要简算)
1305-386-614
1
4
+
2
3
-
5
6
)×12   
1.25×32×2.5  
10.9-(
4
5
+9.6÷4)
(1)1305-386-614,
=1305-(386+614),
=1305-1000,
=305;

(2)(
1
4
+
2
3
-
5
6
)×12,
=
1
4
×12+
2
3
×12-
5
6
×12,
=3+8-10,
=1;
 
(3)1.25×32×2.5,
=(1.25×8)×(4×2.5),
=10×10,
=100;
 
(4)10.9-(
4
5
+9.6÷4),
=10.9-(
4
5
+2.4),
=10.9-3.2,
=7.7.
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