题目内容
【题目】用递等式计算,能简算的要简算。
4920÷24-17×12 0.25×6.7×4
9.43-(1.74+1.43)
【答案】1;6.7;
6.26;35;
【解析】
(1)先算除法和乘法,再算减法;
(2)根据乘法交换律进行简算;
(3)根据乘法分配律进行简算;
(4)根据减法的性质简算;
(5)根据乘法分配律进行简算;
(6)先算加法,再算乘法,最后算除法。
(1)4920÷24-17×12
=205-204
=1
(2)0.25×6.7×4
=0.25×4×6.7
=1×6.7
=6.7
(3)
=
=(-)×
=2×
=
(4)9.43-(1.74+1.43)
=9.43-1.43-1.74
=8-1.74
=6.26
(5)(+)×72
=×72+×72
=8+27
=35
(6)÷[(+)×2]
=÷[×2]
=÷
=
练习册系列答案
相关题目