计算下面各题,能简算的要简算.(1)1.2-0.5×1.8÷0.9 (2)(25+1...

计算下面各题,能简算的要简算.(1)1.2-0.5×1.8÷0.9 (2)(25+16-215)×60 (3)4397×98(4)1.8×14+3.2×25% (5)8×9×1.25 (6)9415-(3415-3.3)

(1)1.2-0.5×1.8÷0.9  
=1.2-0.9÷0.9  
=1.2-1
=0.2;
      
(2)(
2
5
+
1
6
-
2
15
)×60   
=
2
5
×60+
1
6
×60-
2
15
×60 
=24+10-8
=26;
              
(3)
43
97
×98
=
43
97
×(97+1)
=
43
97
×97+
43
97

=43+
43
97

=43
43
97


(4)1.8×
1
4
+3.2×25%    
=(1.8+3.2)×0.25
=5×0.25           
=1.25;

(5)8×9×1.25
=8×1.25×9
=10×9
=90;
            
(6)9
4
15
-(3
4
15
-3.3)
=9
4
15
-3
4
15
+3.3
=6+3.3
=9.3.
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