38.6+一点,二8+1.46的简便运算是什么?
计算下面各题.38.6+1.28+1.465.7-1.26-3.0417.8+0.42-4.8115,4-0.82+1.678.65-(3.56+1.8)6.5+(12....
计算下面各题. 38.6+1.28+1.46 5.7-1.26-3.04 17.8+0.42-4.81 15,4-0.82+1.67 8.65-(3.56+1.8) 6.5+(12.08+4.36)
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(1)38.6+1.28+1.46,
=38.6+(1.28+1.46),
=38.6+2.74,
=41.34;
(2)5.7-1.26-3.04,
=5.7-(1.26+3.04),
=5.7-4.3,
=1.4;
(3)17.8+0.42-4.81,
=18.2-4.81,
=13.41;
(4)15.4-0.82+1.67,
=14.58+1.67,
=16.25;
(5)8.65-(3.56+1.8),
=8.65-5.36,
=3.29;
(6)6.5+(12.08+4.36),
=6.5+16.44,
=22.94.
=38.6+(1.28+1.46),
=38.6+2.74,
=41.34;
(2)5.7-1.26-3.04,
=5.7-(1.26+3.04),
=5.7-4.3,
=1.4;
(3)17.8+0.42-4.81,
=18.2-4.81,
=13.41;
(4)15.4-0.82+1.67,
=14.58+1.67,
=16.25;
(5)8.65-(3.56+1.8),
=8.65-5.36,
=3.29;
(6)6.5+(12.08+4.36),
=6.5+16.44,
=22.94.
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