题目内容

怎样算简便就怎样算.
0.485+0.64+3.36
72.51-9.34-12.66
14.02-4.5+0.98 5.76+2.43+0.24+10.57
182+99×182 9.28-(3.28+2.55)
9.5+4.85-6.13 10.75-1.86-2.75-3.16.
分析:(1)运用加法结合律简算;
(2)根据连续减去两个数等于减去这两个数的和简算;
(3)运用加法交换律简算;
(4)运用加法结合律简算;
(5)运用乘法分配律简算;
(6)根据减去两个数的和等于连续减去这两个数简算;
(7)按照从左到右的顺序计算;
(8)运用加法结合律,以及根据连续减去两个数等于减去这两个数的和简算.
解答:解:(1)0.485+0.64+3.36,
=0.485+(0.64+3.36),
=0.485+4,
=4.485;

(2)72.51-9.34-12.66,
=72.51-(9.34+12.66),
=72.51-22,
=50.51;

(3)14.02-4.5+0.98,
=(14.02+0.98)-4.5,
=15-4.5,
=10.5;

(4)5.76+2.43+0.24+10.57,
=(5.76+0.24)+(2.43+10.57),
=6+13,
=19;

(5)182+99×182,
=182×(99+1),
=182×100,
=18200;

(6)9.28-(3.28+2.55),
=9.28-3.28-2.55,
=6-2.55,
=3.45;

(7)9.5+4.85-6.13,
=14.35-6.13,
=8.22;

(8)10.75-1.86-2.75-3.16,
=(10.75-2.75)-(1.86+3.16),
=8-5.02,
=2.98.
点评:本题主要考查了加减法中的简算方法,要注意分析式中数据,运用合适的简便方法计算.
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