精英家教网 > 小学数学 > 题目详情
请你做小法官,把错误改正过来.
(1)4×3.75+0.25
=4×4
=16
=0
(2)6.4+3.6×5.3
=10×5.3
=53
(3)15.8-0.8×2
=15×2
=30
(4)4.5×0.9+6.8
=4.05+6.8
=4.73.
分析:(1)(2)应先算乘法,再算加法,故原题错误;
(3)应先算乘法,再算减法,故原题错误;
(4)运算顺序正确,但在计算4.05+6.8时,小数点没有对齐,故原题错误.
解答:解:(1)4×3.75+0.25
=4×4
=16
=0(×)
改正:4×3.75+0.25
=15+0.25,
=15.25;

(2)6.4+3.6×5.3
=10×5.3
=53(×)
改正:6.4+3.6×5.3
=6.4+19.08
=25.48;

(3)15.8-0.8×2
=15×2
=30(×)
改正:15.8-0.8×2
=15.8-1.6,
=14.2;

(4)4.5×0.9+6.8
=4.05+6.8
=4.73.(×)
改正:4.5×0.9+6.8
=4.05+6.8
=10.85.
点评:解答此题应注意运算顺序以及运算法则,同时注意小数点要对齐.
练习册系列答案
相关习题

同步练习册答案