问题 解答题

脱式计算(能简便算的要简便算)

(1)0.01+1.01×99                    

(2)26×20.2-8.4-1.8

(3)89.3×43+38×89.3+893×1.9       

(4)10.01×101-10.01.

答案

(1)0.01+1.01×99,

=0.01+1.01×(100-1),

=0.01+1.01×100-1.01×1,

=101+0.01-1.01,

=100;

(2)26×20.2-8.4-1.8,

=26×(20+0.2)-(8.4+1.8),

=520+5.2-10.2,

=525.2-10.2,

=515;

(3)89.3×43+38×89.3+893×1.9,

=89.3×43+38×89.3+89.3×19,

=89.3×(43+38+19),

=89.3×100,

=8930;

(4)10.01×101-10.01,

=10.01×101-10.01×1,

=10.01×(101-1),

=10.01×100,

=1001.

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