问题 解答题
用简便方法计算下面各题.
3.06-2.5+1.943.8+3.98+6.029.53-(4.53+2.4)
76-9.36-30.642.29+3.7+6.71+6.33.25-0.13-1.25-0.87.
答案

(1)3.06-2.5+1.94,

=3.06+1.94-2.5,

=5-2.5,

=2.5;

(2)3.8+3.98+6.02,

=3.8+(3.98+6.02),

=3.8+10,

=13.8;

(3)9.53-(4.53+2.4),

=9.53-4.53-2.4,

=5-2.4,

=2.6;

(4)76-9.36-30.64,

=76-(9.36+30.64),

=76-40,

=36;

(5)2.29+3.7+6.71+6.3,

=(2.29+6.71)+(3.7+6.3),

=9+10,

=19;

(6)3.25-0.13-1.25-0.87,

=3.25-1.25-(0.13+0.87),

=2-1,

=1.

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