题目内容
计算下面各题,能简算的要简算.
0.9+1.08+0.92+0.1
32.54-10.46-4.54
18.73+3.85-2.73
45.6-(83.7-78.8)
0.9+1.08+0.92+0.1
32.54-10.46-4.54
18.73+3.85-2.73
45.6-(83.7-78.8)
分析:(1)运用加法交换律与结合律简算;
(2)(3)运用加法交换律简算;
(4)先算括号内的,再算括号外的.
(2)(3)运用加法交换律简算;
(4)先算括号内的,再算括号外的.
解答:解:(1)0.9+1.08+0.92+0.1,
=(0.9+0.1)+(1.08+0.92),
=1+2,
=3;
(2)32.54-10.46-4.54,
=(32.54-4.54)-10.46,
=28-10.46,
=17.54;
(3)18.73+3.85-2.73,
=(18.73-2.73)+3.85,
=16+3.85,
=19.85;
(4)45.6-(83.7-78.8),
=45.6-4.9,
=40.7.
=(0.9+0.1)+(1.08+0.92),
=1+2,
=3;
(2)32.54-10.46-4.54,
=(32.54-4.54)-10.46,
=28-10.46,
=17.54;
(3)18.73+3.85-2.73,
=(18.73-2.73)+3.85,
=16+3.85,
=19.85;
(4)45.6-(83.7-78.8),
=45.6-4.9,
=40.7.
点评:此题考查了小数的四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算律简便计算.
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