用简便方法计算.8-4.9-5.1 6.75-(0.9+3.75) 34+1.8+3.66+0.2 0.96-0.28+
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用简便方法计算. 8-4.9-5.1 | 6.75-(0.9+3.75) |
34+1.8+3.66+0.2 | 0.96-0.28+0.04-0.72. |
![用简便方法计算.8-4.9-5.1 6.75-(0.9+3.75) 34+1.8+3.66+0.2 0.96-0.28+](/uploads/image/z/3558402-18-2.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%8E8-4.9-5.1+6.75-%EF%BC%880.9%2B3.75%EF%BC%89+34%2B1.8%2B3.66%2B0.2+0.96-0.28%2B)
(1)8-4.9-5.1,
=8-(4.9+5.1),
=8-10,
=-2;
(2)6.75-(0.9+3.75),
=6.75-0.9-3.75,
=6.75-3.75-0.9,
=3-0.9,
=2.1;
(3)34+1.8+3.66+0.2,
=34+3.66+(1.8+0.2),
=34+3.66+2,
=39.66;
(4)0.96-0.28+0.04-0.72,
=(0.96+0.04)-(0.28+0.72),
=1-1,
=0.
=8-(4.9+5.1),
=8-10,
=-2;
(2)6.75-(0.9+3.75),
=6.75-0.9-3.75,
=6.75-3.75-0.9,
=3-0.9,
=2.1;
(3)34+1.8+3.66+0.2,
=34+3.66+(1.8+0.2),
=34+3.66+2,
=39.66;
(4)0.96-0.28+0.04-0.72,
=(0.96+0.04)-(0.28+0.72),
=1-1,
=0.