简算题五年级带答案

简算题五年级带答案
2024-11-18 22:59:03
推荐回答(5个)
回答1:

简算:

(1)2.5×32×0.125

=(2.5×4)×(8×0.125)

=10×1

=10

(2)3.5-7+6.5

=3.5+6.5-7

=3

(3)1.2×2.5+0.8×2.5

=2.5(1.2+0.8)

=25

(4)8.9×1.25-0.9×1.25

=1.25×(8.9-0.9)

=10

(5)12.5×7.4×0.8

=12.5×0.8×7.4

=74

含义

“4.9+0.1-4.9+0.1”这是小学数学第八册练习二十七第二题中的一道非常简单的常见简便运算题。当我给学生布置了这道题后,我以为学生会毫不犹豫地使用加法交换率和结合率,顺利完成此题,但是当我批改学生的作业时,却发现了以下三种情况:

①4.9+0.1-4.9+0.1=(4.9-4.9)+(0.1+0.1)。

②4.9+0.1-4.9+0.1=4.9-4.9+0.1+0.1。

③4.9+0.1-4.9+0.1=(4.9+0.1)-(4.9+0.1)。

回答2:

(1)2.5×32×0.125
=(2.5×4)×(8×0.125)
=10×1
=10
(2)3.5-7+6.5
=3.5+6.5-7
=3
(3)1.2×2.5+0.8×2.5
=2.5(1.2+0.8)
=25
(4)8.9×1.25-0.9×1.25
=1.25×(8.9-0.9)
=10
(5)12.5×7.4×0.8
=12.5×0.8×7.4
=74
(6)6.5×9.5+6.5×0.5
=6.5×(9.5+0.5)
=6.5×10
=65
(7)0.35×1.6+0.35×3.4
=0.35×(1.6+3.4)
=0.35×5
=1.75
(8)6.72-3.28-1.72
=6.75-(3.28+1.72)
=6.75-5
=1.75
(9)0.45+6.37+4.55
=0.45+4.55+6.37
=5+6.37
=11.37
(10)28×12.5-12.5×20
=(28-20)×12.5
=8×12.5
=100
(11)23.65-(3.07+3.65)
=23.65-3.65-3.07
=20-3.07
=16.93
(12)(4+0.4×0.25)×8×7×1.25
=(4+1)×7×(8×1.25)
=5×7×10
=350
(13)1.65×99+1.65
=1.65×(99+1)
=1.65×100
=165
(14)27.85-(7.85+3.4)
=27.85-7.85+3.4
=20+3.4
=23.4
(15)7.8×9.9+0.78
=7.8×(9.9+0.1)
=7.8×10
=78
(16)4.8×46+4.8×54
=(46+54)×4.8
=100×4.8
=480
(17)673-327-173
=673-(327+173)
=673-500
=173
(18)4.44×2.5
=1.11×(4×2.5)
=1.11×10
=11.1
(19)3.5÷1.4
=(3.5÷0.7)÷(1.4÷0.7)
=5÷2
=2.5
(20)1+2+3+4+5+……+99+100
=(1+100)×100÷2
=101×100÷2
=1010÷2
=5050
编辑于 2017-08-03
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回答3:

(1)2.5×32×0.125
=(2.5×4)×(8×0.125)
=10×1
=10
(2)3.5-7+6.5
=3.5+6.5-7
=3
(3)1.2×2.5+0.8×2.5
=2.5(1.2+0.8)
=25
(4)8.9×1.25-0.9×1.25
=1.25×(8.9-0.9)
=10
(5)12.5×7.4×0.8
=12.5×0.8×7.4
=74
(6)6.5×9.5+6.5×0.5
=6.5×(9.5+0.5)
=6.5×10
=65
(7)0.35×1.6+0.35×3.4
=0.35×(1.6+3.4)
=0.35×5
=1.75
(8)6.72-3.28-1.72
=6.75-(3.28+1.72)
=6.75-5
=1.75
(9)0.45+6.37+4.55
=0.45+4.55+6.37
=5+6.37
=11.37
(10)28×12.5-12.5×20
=(28-20)×12.5
=8×12.5
=100
(11)23.65-(3.07+3.65)
=23.65-3.65-3.07
=20-3.07
=16.93
(12)(4+0.4×0.25)×8×7×1.25
=(4+1)×7×(8×1.25)
=5×7×10
=350
(13)1.65×99+1.65
=1.65×(99+1)
=1.65×100
=165
(14)27.85-(7.85+3.4)
=27.85-7.85+3.4
=20+3.4
=23.4
(15)7.8×9.9+0.78
=7.8×(9.9+0.1)
=7.8×10
=78
(16)4.8×46+4.8×54
=(46+54)×4.8
=100×4.8
=480
(17)673-327-173
=673-(327+173)
=673-500
=173
(18)4.44×2.5
=1.11×(4×2.5)
=1.11×10
=11.1
(19)3.5÷1.4
=(3.5÷0.7)÷(1.4÷0.7)
=5÷2
=2.5
(20)1+2+3+4+5+……+99+100
=(1+100)×100÷2
=101×100÷2
=1010÷2
=5050

回答4:

(1)2.5×32×0.125
=(2.5×4)×(8×0.125)
=10×1
=10
(2)3.5-7+6.5
=3.5+6.5-7
=3
(3)1.2×2.5+0.8×2.5
=2.5(1.2+0.8)
=25
(4)8.9×1.25-0.9×1.25
=1.25×(8.9-0.9)
=10
(5)12.5×7.4×0.8
=12.5×0.8×7.4
=74
(6)6.5×9.5+6.5×0.5
=6.5×(9.5+0.5)
=6.5×10
=65
(7)0.35×1.6+0.35×3.4
=0.35×(1.6+3.4)
=0.35×5
=1.75
(8)6.72-3.28-1.72
=6.75-(3.28+1.72)
=6.75-5
=1.75
(9)0.45+6.37+4.55
=0.45+4.55+6.37
=5+6.37
=11.37
(10)28×12.5-12.5×20
=(28-20)×12.5
=8×12.5
=100

回答5:

3.2X12.5
=0.8X12.5X4
=40
5.66x101
=5.66x100+5.66x 1
=571.66