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)④47×724+15÷65⑤14÷(1-
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| 用递等式计算(能简算的要用简便方法计算). ①13×8×125 ②8.9×99+1.1×99 ③12.12÷(4.3×2-7.4) ④ ⑤ |
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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,
④47×724+15÷65,
=16+16,
=13,
⑤14÷(1-12-14),
=14÷14,
=1.
