三年级下册50道脱式计算题及答案（50道脱式计算题及答案）

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（1）2.5*32*0.125

=（2.5*4）*（8*0.125）

=10*1

=10

=3.5+6.5-7

=3

=2.5(1.2+0.8)

=25

=1.25(8.9-0.9)

=10

=12.5×0.8×7.4

=74

=6.5×（9.5+0.5）

=6.5×10

=65

=0.35*（1.6+3.4）

=0.35*5

=1.75

=6.75-（3.28+1.72）

=6.75-5

=1.75

=0.45+4.55+6.37

=5+6.37

=11.37

=（28-20）*12.5

=8*12.5

=100

=23.65-3.65-3.07

=20-3.07

=16.93

=（4+1）*7*10

=5*7*10

=350

=1.65*（99+1）

=1.65*100

=165

=27.85-7.85+3.4

=20+3.4

=23.4

7.8×9.9+0.78

=7.8*（9.9+0.1）

=7.8*10

=78

=（46+54）*4.8

=100*4.8

=480

=673-（327+173）

=673-500

=173

=1.11*（4*2.5）

=1.11*10

=11.1

=（3.5÷0.7）÷（1.4÷0.7）

=5÷2

=2.5

=（1+99）+（2+98）+（3+97）+.+（49+51）+50

=（100÷2-1）*100+50

=4900+50

=4950

=440.2+2.9,

=443.1；

=（4+0.2）×0.25,

=4×0.25+0.2×0.25,

=1+0.05,

=1.05；

=（5.2+0.8）×4.3,

=6×4.3,

=25.8．

=8.5+6×4,

=8.5+24,

=32.5．

=0.2+2.5%,

=0.225；

=4×8×125×2.5,

=8×125×（4×2.5）,

=1000×10,

=10000；

=94÷（58.14-57.2）,

=94÷0.94,

=100．

=13÷（0.4×2.5）,

=13÷1,

=13；

=（1.25×0.8）×2.5,

=1×2.5,

=2.5；

=1.5×（101-1）,

=1.5×100,

=150；

=4.8×100+4.8×1,

=480+4.8,

=484.8．

=15.275-7.8,

=7.475；

=0.57+0.1032,

=0.6732．

=189÷3,

=63；

=456÷2,

=228；

=516×6,

=3096．

=200+825,

=1025；

=51×48,

=2448．

=576-397,

=179；

=773-556,

=217．

=4.82-6.5×0.6,

=4.82-3.9,

=0.92．

（43）2.4/7 × 5/9 + 3/7 × 5/9 =(4/7+3/7)x5/9 =1x5/9 =5/9 

（44）3.5/2 -（ 3/2 + 4/5 ） =5/2-3/2-4/5 =1-4/5 =1/5 

（45）4.6 ×（ 1/2 + 2/3 ） =6x1/2+6x2/3 =3+4 =7

 （46）5.8 × 4/5 + 8 × 11/5 =8x(4/5+11/5) =8x3 =24 

（47）6.31 × 5/6 – 5/6 =(31-1)x5/6 =30x5/6 =25 

（48）7.4/5 × 25/16 + 2/3 × 3/4 =5/4+1/2 =5/4+2/4 =7/4 

（49）8.101 × 1/5 – 1/5 × 21 =(101-21)x1/5 =80x1/5 =16

（50）25×（2+4） =25×2+25×4 =50+100 =150

望采纳！

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