脱式计算.(能简算的请简算)4.36+8.3+3.6437.7-(8.98+7.7)19.57-2.37-3.638-7.24+5.87.
问题描述:
脱式计算.(能简算的请简算)
4.36+8.3+3.64
37.7-(8.98+7.7)
19.57-2.37-3.63
8-7.24+5.87.
答
(1)4.36+8.3+3.64,
=(4.36+3.64)+8.3,
=8+8.3,
=16.3;
(2)37.7-(8.98+7.7),
=37.7-7.7-8.98,
=30-8.98,
=21.02;
(3)19.57-2.37-3.63,
=19.57-(2.37+3.63),
=19.57-6,
=13.57;
(4)8-7.24+5.87,
=0.76+5.87,
=6.63.
答案解析:(1)运用加法交换率简算;
(2)运用减法的性质以及加法结合律简算;
(3)运用减法的性质简算;
(4)从左往右依次运算.
考试点:小数四则混合运算;运算定律与简便运算.
知识点: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定律简便计算.