用简便方法计算.6.32+7.89+3.68 25.23-7.8-2.2 1?
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①6.32+7.89+3.68,
=(6.32+3.68)+7.89,
=10+7.89,
=17.89;
②25.23-7.8-2.2,
=25.23-(7.8+2.2),
=25.23-10,
=15.23;
③125×(33×8),
=(125×8)×33,
=1000×33,
=33000;
④49×19+81×49,
=49×(19+81),
=49×100,
=4900;
⑤7200÷4÷25,
=7200÷(4×25),
=7200÷100,
=72;
⑥78×51-78,
=78×(51-1),
=78×50,
=3900;,9,用简便方法计算.
6.32+7.89+3.68
25.23-7.8-2.2
125×(33×8)
49×19+81×49
7200÷4÷25
78×51-78.
=(6.32+3.68)+7.89,
=10+7.89,
=17.89;
②25.23-7.8-2.2,
=25.23-(7.8+2.2),
=25.23-10,
=15.23;
③125×(33×8),
=(125×8)×33,
=1000×33,
=33000;
④49×19+81×49,
=49×(19+81),
=49×100,
=4900;
⑤7200÷4÷25,
=7200÷(4×25),
=7200÷100,
=72;
⑥78×51-78,
=78×(51-1),
=78×50,
=3900;,9,用简便方法计算.
6.32+7.89+3.68
25.23-7.8-2.2
125×(33×8)
49×19+81×49
7200÷4÷25
78×51-78.
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