题目内容

用递等式计算(能简算的请简算).
①884÷34+17×21②4.2-1.38+5.8-4.62 ③
4
5
×
11
15
+
4
5
÷
15
4
④12×8.9+1.2×11
⑤(
4
5
+
1
4
)÷
7
3
-
3
10
7
10
-(0.5+
3
5
)×0.3.
①884÷34+17×21,
=26+357,
=383;
②4.2-1.38+5.8-4.62,
=(4.2+5.8)-(1.38+4.62),
=10-6,
=4;
4
5
×
11
15
+
4
5
÷
15
4

=
4
5
×
11
15
+
4
5
×
4
15

=(
11
15
+
4
15
)×
4
5

=1×
4
5

=
4
5

④12×8.9+1.2×11,
=12×8.9+12×1.1,
=(1.1+8.9)×12,
=10×12,
=120;
⑤(
4
5
+
1
4
)÷
7
3
-
3
10

=
21
20
×
3
7
-
3
10

=
9
20
-
3
10

=
3
20

7
10
-(0.5+
3
5
)×0.3
=0.7-(0.5+0.6)×0.3,
=0.7-0.33,
=0.37.
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