一.简便运算 546+198 256+398 654-206

2024-12-29 08:53:09
推荐回答(1个)
回答1:

546+198
=546+200-2
=746-2
=744
256+398
=256+400-2
=656-2
=654
654-206
=654-200-6
=454-6
=448
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