用简便方法计算.6.32+7.89+3.68
用简便方法计算.6.32+7.89+3.6825.23-7.85-2.15125×(73×8)302×99+3027200÷4÷25462×58÷231....
用简便方法计算.6.32+7.89+3.68 25.23-7.85-2.15 125×(73×8) 302×99+302 7200÷4÷25 462×58÷231.
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(1)6.32+7.89+3.68
=6.32+3.68+7.89
=10+7.89
=17.89;
(2)25.23-7.85-2.15
=25.23-(7.85+2.15)
=25.23-10
=15.23;
(3)125×(73×8)
=125×8×73
=1000×73
=73000;
(4)302×99+302
=302×(99+1)
=302×100
=30200;
(5)7200÷4÷25
=7200÷(4×25)
=7200÷100
=72;
(6)462×58÷231
=462÷231×58
=2×58
=116.
=6.32+3.68+7.89
=10+7.89
=17.89;
(2)25.23-7.85-2.15
=25.23-(7.85+2.15)
=25.23-10
=15.23;
(3)125×(73×8)
=125×8×73
=1000×73
=73000;
(4)302×99+302
=302×(99+1)
=302×100
=30200;
(5)7200÷4÷25
=7200÷(4×25)
=7200÷100
=72;
(6)462×58÷231
=462÷231×58
=2×58
=116.
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