用递等式计算(能简算的要用简便方法计算).①13×8×125②8.9×99+1.1×99③12.12÷(4.3×2-7.4)④

用递等式计算(能简算的要用简便方法计算).①13×8×125②8.9×99+1.1×99③12.12÷(4.3×2-7.4)④ 4 7 × 7 24 + 1 5 ÷ 6 5 ⑤ 1 4 ÷(1- 1 2 - 1 4 )

①13×8×125,
=13×(8×125),
=13×1000,
=13000,
②8.9×99+1.1×99,
(8.9+1.1)×99,
=10×99,
=990,
③12.12÷(4.3×2-7.4),
=12.12÷1.2,
=10.1,
4
7
×
7
24
+
1
5
÷
6
5

=
1
6
+
1
6

=
1
3

1
4
÷(1-
1
2
-
1
4
),
=
1
4
÷
1
4

=1.
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