小学中高年级简便计算(后附答案)
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1)125 ×(17 × 8)× 4
2)375 × 480 6250 × 48
3)25 × 16 ×125
4)13 × 99
5)75000 ÷ 125 ÷ 15
6)7900 ÷ 4 ÷ 25
7)150 × 40 ÷ 50
8)5600 ÷(25 × 7)
9)210 ÷ 42 × 6
10)39600 ÷ 25
11)67 × 21 +18 × 21 85 × 79
12)321 × 81 321 × 19
13)222222 × 999999
14)333333 × 333333
15)56000 ÷ (14000 ÷ 16)
数学简便计算题及答案:
1)125 ×(17 × 8)× 4
= 125×8×4×17
=1000×68
=68000
2)375 × 480 6250 × 48
=480×(375+625)
=480000
3)25 × 16 ×125
=25×2×8×125
=50000
4)13 × 99
=13×(100-1)
=1300-13
=1287
5)75000 ÷ 125 ÷ 15
=75×1000÷125÷15
=75÷15×1000÷125
=5×8
=40
6)7900 ÷ 4 ÷ 25
=7900÷(4×25)
=79
7)150 × 40 ÷ 50
=150÷50×40
=3×40
=120
8)5600 ÷(25 × 7)
=5600÷7÷25
=800÷25
=100÷25×8
=32
9)210 ÷ 42 × 6
=210÷7÷6×6
=30
10)39600 ÷ 25
=396×100÷25
=396×4
=1584
11)67 × 21 +18 × 21 85 × 79
=21×(67 18) 85×79
=21×85 85×79
=85×(21 79)
=8500
12)321 × 81 321 × 19
=321×(81 19)
=32100
13)222222 × 999999
=222222×(1000000-1)
=222222000000-222222
=222221777778
14)333333 × 333333
=111111×999999
=111111×(1000000-1)
=111111000000-111111
=111110888889
15)56000 ÷(14000 ÷ 16)
=4×16
=64