问题 解答题
简便计算.
9.6+1.8-1.60.21+3.48+0.89+2.5215.3-(0.91+2.3)
答案

(1)9.6+1.8-1.6,

=(9.6-1.6)+1.8,

=8+1.8,

=9.8;

(2)0.21+3.48+0.89+2.52,

=(0.21+0.89)+(3.48+2.52),

=1.1+6,

=7.1;

(3)15.3-(0.91+2.3),

=15.3-0.91-2.3,

=(15.3-2.3)-0.91,

=13-0.91,

=12.09.

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