题目内容
脱式计算
15.52-1.6×5-5.7 14.32+6.83-4.32+0.17
34.6×4.6+34.6×5.4 100.1×101-101.
15.52-1.6×5-5.7 14.32+6.83-4.32+0.17
34.6×4.6+34.6×5.4 100.1×101-101.
分析:(1)先算乘法,再从左向右进行计算;
(2)根据加法的交换律和结合律解答;
(3)运用乘法的分配律进行简算;
(4)运用乘法的分配律进行简算.
(2)根据加法的交换律和结合律解答;
(3)运用乘法的分配律进行简算;
(4)运用乘法的分配律进行简算.
解答:解:(1)15.52-1.6×5-5.7
=15.52-8-5.7
=7.52-5.7
=1.82
(2)14.32+6.83-4.32+0.17
=(14.32-4.32)+(6.83+0.17)
=10+7
=17
(3)34.6×4.6+34.6×5.4
=(4.6+5.4)×34.6
=10×34.6
=346
(4)100.1×101-101
=(100.1-1)×101
=99.1×101
=99.1×(100+1)
=99.1×100+99.1×1
=9910+99.1
=10009.1
=15.52-8-5.7
=7.52-5.7
=1.82
(2)14.32+6.83-4.32+0.17
=(14.32-4.32)+(6.83+0.17)
=10+7
=17
(3)34.6×4.6+34.6×5.4
=(4.6+5.4)×34.6
=10×34.6
=346
(4)100.1×101-101
=(100.1-1)×101
=99.1×101
=99.1×(100+1)
=99.1×100+99.1×1
=9910+99.1
=10009.1
点评:考查了小数的四则混合运算.注意运算顺序和运算法则.
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