四年级数学简便计算题及
答案
八年级地理上册填图题岩土工程勘察试题省略号的作用及举例应急救援安全知识车间5s试题及答案
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) 16)654321 × 909090 +654321 × 90909
17)34 × 3535 ,35 × 3434 18)27000 ? 125
19)345345 ? 15015 20)347 + 358 + 352 + 349
21)75 × 45 + 17 × 25 22)599996 + 49997 + 3998 + 407 + 89
23)(48 × 75 ×81)?(24 × 25 × 27)
四年级数学简便计算题及答案:
1)125 ×(17 × 8)× 4 2)375 × 480 + 6250 × 48
= 125×8×4×17 =480×(375，625)
=1000×68 =480000
=68000
3)25 × 16 ×125 4)13 × 99
=25×2×8×125 =13×(100,1)
=50000 =1300,13
=1287 5)75000 ? 125 ? 15 6)7900 ? 4 ? 25
=75×1000?125?15 =7900?(4×25)
=75?15×1000?125 =79
=5×8
=40
7)150 × 40 ? 50 8)5600 ?(25 × 7)
=150?50×40 =56×100?25?7
=3×40 =56?7×100?25
=120 =32 )210 ? 42 × 6 10)39600 ? 25 9
=210?7?6×6 =396×100?25
=30 =396×4
=1584
11)67 × 21 ，18 × 21 + 85 × 79 12)321 × 81 + 321 × 19
=21×(67+18)+85×79 =321×(81+19)
=21×85+85×79 =32100
=85×(21+79)
=8500
13)222222 × 999999 14)333333 × 333333
=222222×(1000000,1) =111111×999999
=222222000000,222222 =111111×(1000000,1)
=222221777778 =111111000000,111111
=111110888889 15)56000 ? (14000 ? 16) 16)654321 × 909090 +654321×90909
=56000?14000×16 =654321×999999 =4×16 =654321×(100000,1)
=64 =654321000000,654321
=654320345679
17)34 × 3535 ,35 × 3434 18)27000 ? 125
=34×35×101,35×34×101 =27×1000?125
=0 =27×8
=216 19)345345 ? 15015 20)347 + 358 + 352 + 349
=345×1001?(15×1001) =350×4,3+8+2,1
=345?15×1001?1001 =1400+6
=23 =1406
21)75 × 45 + 17 × 25 22) 599996 + 49997 + 3998 + 407 + 89
=25×3×45+17×25 =600000+50000+4000,4,3,2+407+89
=25×(135+17) =65400+487 =25×152 =65887
=25×4×38
=3800
23)(48 × 75 ×81)?(24 × 25 × 27)
=48?24×75?25×81?27
=2×3×3
=18
浙公网安备 33021202002483