题目内容

2.计算下面各题,怎样计算简便就怎样计算.
0.56×99+0.56             1.2×2.5+0.8×2.5            3.64+9.76+6.36                
3.2+1.27-2.49             4.14+5.86-1.11               5-0.05+4.95.

分析 (1)(2)根据乘法分配律计算;
(3)变形为3.64+6.36+9.76进行计算;
(4)(5)(6)从左往右依次进行计算.

解答 解:(1)0.56×99+0.56
=0.56×(99+1)
=0.56×100
=56

(2)1.2×2.5+0.8×2.5
=(1.2+0.8)×2.5
=2×2.5
=5

(3)3.64+9.76+6.36
=3.64+6.36+9.76
=10+9.76
=19.76

(4)3.2+1.27-2.49 
=4.47-2.49
=1.98

(5)4.14+5.86-1.11
=10-1.11
=8.89

(6)5-0.05+4.95
=4.95+4.95
=9.9

点评 考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.

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