题目内容

神机妙算:(能简算的要写出简算过程)
(1)( 
1
4
-
1
7
)×28+4
4
7
×7-3
4
7
×7
(2)
1
8
×78+0.5×1.25-730÷80+24×
51
43
+51×
19
43

(3)[22.5+(3
3
5
+1.8-1.21×
5
11
)]÷40%
(4)[47-(18.75-1÷
8
15
)×2]÷0.46
(5)(0.7×
2
3
-0.11×
5
6
)÷0.125+(
3
2
-
4
3
)÷(
5
6
×
3
4

(1)(
1
4
-
1
7
)×28+4
4
7
×7-3
4
7
×7,
=
1
4
×28-
1
7
×28+(4
4
7
-3
4
7
)×7,
=7-4+1×7,
=3+7,
=10;

(2)
1
8
×78+0.5×1.25-730÷80+24×
51
43
+51×
19
43

=0.125×78+5×0.125-73×0.125+51×
24
43
+51×
19
43

=(78+5-73)×0.125+51×(
24
43
+
19
43
),
=10×0.125+51×1,
=1.25+51,
=52.25;

(3)[22.5+(3
3
5
+1.8-1.21×
5
11
)]÷40%,
=[22.5+(3
3
5
+1.8-0.55)]÷40%,
=[22.5+(5.4-0.55)]÷40%,
=[22.5+4.85]÷40%,
=27.35÷40%,
=68.375;

(4)[47-(18.75-1÷
8
15
)×2]÷0.46,
=[47-(18.75-1.875)×2]÷0.46,
=[47-16.875×2]÷0.46,
=[47-33.75]÷0.46,
=13.25÷0.46,
=28
37
46


(5)(0.7×
2
3
-0.11×
5
6
)÷0.125+(
3
2
-
4
3
)÷(
5
6
×
3
4
),
=(
7
15
-
11
120
)÷0.125+
1
6
÷
5
8

=
3
8
÷0.125+
1
6
÷
5
8

=3+
4
15

=3
4
15
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