题目内容
脱式计算.
| 909-(317+538)= | 63÷7×21= | 302×(504-498)= |
(1)909-(317+538),
=909-855,
=54;
(2)63÷7×21,
=9×21,
=189;
(3)302×(504-498),
=302×6,
=1812.
=909-855,
=54;
(2)63÷7×21,
=9×21,
=189;
(3)302×(504-498),
=302×6,
=1812.
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