用你喜欢的方法计算下面各题. 13.75-5.28-4.72 &nbs...
用你喜欢的方法计算下面各题.13.75-5.28-4.722.25+4.8+0.758-7.19+3.839.65-(7.03+1.65)8.4-7.85+3.22.58...
用你喜欢的方法计算下面各题. 13.75-5.28-4.72 2.25+4.8+0.75 8-7.19+3.83 9.65-(7.03+1.65) 8.4-7.85+3.2 2.58-(3.5-2.42)
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①13.75-5.28-4.72
=13.75-(5.28+4.72)
=13.75-10
=3.75;
②2.25+4.8+0.75
=4.8+(2.25+0.75)
=4.8+3
=7.8;
③8-7.19+3.83
=0.81+3.83
=4.64;
④9.65-(7.03+1.65)
=9.65-1.65-7.03
=8-7.03
=0.97;
⑤8.4-7.85+3.2
=0.55+3.2
=3.75;
⑥2.58-(3.5-2.42)
=2.58+2.42-3.5
=5-3.5
=1.5.
=13.75-(5.28+4.72)
=13.75-10
=3.75;
②2.25+4.8+0.75
=4.8+(2.25+0.75)
=4.8+3
=7.8;
③8-7.19+3.83
=0.81+3.83
=4.64;
④9.65-(7.03+1.65)
=9.65-1.65-7.03
=8-7.03
=0.97;
⑤8.4-7.85+3.2
=0.55+3.2
=3.75;
⑥2.58-(3.5-2.42)
=2.58+2.42-3.5
=5-3.5
=1.5.
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