题目内容
数学医院.
318-139-39
=318-(139-39)
=318-100
=218
______

354-(154+72)
=354-154+72
=200+72
=272
______

318-139-39
=318-(139-39)
=318-100
=218
______
354-(154+72)
=354-154+72
=200+72
=272
______
(1)是错误的,改正为:
318-139-39
=318-(139+139),
=318-278,
=40.
(2)是错误的,改正为:
354-(154+72)
=354-154-72,
=200-72,
=128.
故答案为:×,×.
318-139-39
=318-(139+139),
=318-278,
=40.
(2)是错误的,改正为:
354-(154+72)
=354-154-72,
=200-72,
=128.
故答案为:×,×.
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