题目内容
用简便方法计算:
①(56+74)+126
②743-246-154
③7000÷25.
①(56+74)+126
②743-246-154
③7000÷25.
①(56+74)+126,
=56+(74+126),
=256;
②743-246-154,
=743-(246+154),
=343;
③7000÷25,
=(7000×4)÷(25×4),
=280.
=56+(74+126),
=256;
②743-246-154,
=743-(246+154),
=343;
③7000÷25,
=(7000×4)÷(25×4),
=280.
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