脱式计算(怎样简便怎样算):43-(25+24÷223 );(310×0.87+0.23×310)÷3%;32×3031+131;3.59-1.

脱式计算(怎样简便怎样算):43-(25+24÷223 );(310×0.87+0.23×310)÷3%;32×3031+131;3.59-1.81-0.19-0.59.

(1)43-(
2
5
+24÷2
2
3
 ),
=43-(
2
5
+24÷
8
3
),
=43-(
2
5
+24×
3
8
),
=43-
2
5
-9,
=43-9-
2
5

=34-
2
5

=33
3
5


(2)(
3
10
×0.87+0.23×
3
10
)÷3%,
=
3
10
×(0.87+0.23)÷
3
100

=
3
10
×1.1×
100
3

=
3
10
×
100
3
×1.1,
=10×1.1,
=11;

(3)32×
30
31
+
1
31

=(31+1)×
30
31
+
1
31

=31×
30
31
+
30
31
+
1
31

=30+1,
=31;

(4)3.59-1.81-0.19-0.59,
=(3.59-0.59)-(1.81+0.19),
=3-2,
=1.
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