用递等式计算.①[1-( 1 8 + 2 3 )]×36②( 2 9 + 7 12 )×36③7.5×4.7+4.7×2

用递等式计算.
①[1-(
1
8
+
2
3
)]×36
②(
2
9
+
7
12
)×36
③7.5×4.7+4.7×2.5
④25.3×12-33.46÷0.35
5
6
×[
2
3
÷(1-
13
15
)]
1
4
+(
5
8
-
3
10
)÷
1
2
sz2468 1年前 已收到1个回答 举报

晓程程 幼苗

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①[1-(
1
8 +
2
3 )]×36,
=[1-(
3
24 +
16
24 )]×36,
=[1-
19
24 ]×36,
=
5
24 ×36,
=
15
2 ;

②(
2
9 +
7
12 )×36,
=36×
2
9 +
7
12 ×36 ,
=8+21,
=29;

③7.5×4.7+4.7×2.5,
=4.7×(7.5+2.5),
=4.7×10,
=47;

④25.3×12-33.46÷0.35,
=303.6-95.6,
=208;


5
6 ×[
2
3 ÷(1-
13
15 )],
=
5
6 ×[
2
3 ÷
2
15 ],
=
5
6 × [
2
3 ×
15
2 ],
=
5
6 ×5,
=4
1
6 ;


1
4 +(
5
8 -
3
10 )÷
1
2 ,
=
1
4 +(
25
40 -
12
40 )×2,
=
1
4 +
13
40 ×2,
=
5
20 +
13
20 ,
=
9
10 .

1年前

7
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