用简便方法计算. (1)101×67 (2)98.5-42.28-7.72 (3)1.38+14.7+8.62+5.3
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用简便方法计算.
(1)101×67 | (2)98.5-42.28-7.72 | (3)1.38+14.7+8.62+5.3 | (4)3200÷4÷25. |
![用简便方法计算. (1)101×67 (2)98.5-42.28-7.72 (3)1.38+14.7+8.62+5.3](/uploads/image/z/6084847-55-7.jpg?t=%E7%94%A8%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E8%AE%A1%E7%AE%97%EF%BC%8E+%EF%BC%881%EF%BC%89101%C3%9767+%EF%BC%882%EF%BC%8998.5-42.28-7.72+%EF%BC%883%EF%BC%891.38%2B14.7%2B8.62%2B5.3)
(1)101×67,
=(100+1)×67,
=100×67+1×67,
=6700+67,
=6767;
(2)98.5-42.28-7.72,
=98.5-(42.28+7.72),
=98.5-50,
=48.5;
(3)1.38+14.7+8.62+5.3,
=(1.38+8.62)+(14.7+5.3),
=10+20,
=30;
(4)3200÷4÷25,
=3200÷(25×4),
=3200÷100,
=32.
=(100+1)×67,
=100×67+1×67,
=6700+67,
=6767;
(2)98.5-42.28-7.72,
=98.5-(42.28+7.72),
=98.5-50,
=48.5;
(3)1.38+14.7+8.62+5.3,
=(1.38+8.62)+(14.7+5.3),
=10+20,
=30;
(4)3200÷4÷25,
=3200÷(25×4),
=3200÷100,
=32.