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20道脱式计算

以下为 20 道脱式计算题目及答案,涵盖整数、小数和分数的四则运算:

整数运算

 

32+18×52432 + 18×5 - 24

先算乘法:18×5=9018×5 = 90

再依次计算加法和减法:32+9024=12224=9832 + 90 - 24 = 122 - 24 = 98

 

 

120÷(4+2×3)120÷(4 + 2×3)

先算括号内乘法:2×3=62×3 = 6

再算括号内加法:4+6=104 + 6 = 10

最后算除法:120÷10=12120÷10 = 12

 

 

25×(408)÷525×(40 - 8)÷5

先算括号内减法:408=3240 - 8 = 32

再算乘法:25×32=80025×32 = 800

最后算除法:800÷5=160800÷5 = 160

 

 

78+360÷(153)78 + 360÷(15 - 3)

先算括号内减法:153=1215 - 3 = 12

再算除法:360÷12=30360÷12 = 30

最后算加法:78+30=10878 + 30 = 108

 

 

45012×15+30450 - 12×15 + 30

先算乘法:12×15=18012×15 = 180

再依次计算减法和加法:450180+30=270+30=300450 - 180 + 30 = 270 + 30 = 300

 

小数运算

 

2.5×(3.2+1.8)4.52.5×(3.2 + 1.8) - 4.5

先算括号内加法:3.2+1.8=53.2 + 1.8 = 5

再算乘法:2.5×5=12.52.5×5 = 12.5

最后算减法:12.54.5=812.5 - 4.5 = 8

 

 

18.6÷(3.11.6)+2.418.6÷(3.1 - 1.6) + 2.4

先算括号内减法:3.11.6=1.53.1 - 1.6 = 1.5

再算除法:18.6÷1.5=12.418.6÷1.5 = 12.4

最后算加法:12.4+2.4=14.812.4 + 2.4 = 14.8

 

 

5.6×(4.22.8)÷1.45.6×(4.2 - 2.8)÷1.4

先算括号内减法:4.22.8=1.44.2 - 2.8 = 1.4

再算乘法:5.6×1.4=7.845.6×1.4 = 7.84

最后算除法:7.84÷1.4=5.67.84÷1.4 = 5.6

 

 

9.8+3.6÷0.92.59.8 + 3.6÷0.9 - 2.5

先算除法:3.6÷0.9=43.6÷0.9 = 4

再依次计算加法和减法:9.8+42.5=13.82.5=11.39.8 + 4 - 2.5 = 13.8 - 2.5 = 11.3

 

 

4.5×(2.4÷1.2)3.74.5×(2.4÷1.2) - 3.7

先算括号内除法:2.4÷1.2=22.4÷1.2 = 2

再算乘法:4.5×2=94.5×2 = 9

最后算减法:93.7=5.39 - 3.7 = 5.3

 

分数运算

 

34+16×(3213)\frac{3}{4} + \frac{1}{6}×( \frac{3}{2} - \frac{1}{3} )

先算括号内减法:3213=9626=76\frac{3}{2} - \frac{1}{3} = \frac{9}{6} - \frac{2}{6} = \frac{7}{6}

再算乘法:16×76=736\frac{1}{6}×\frac{7}{6} = \frac{7}{36}

最后算加法:34+736=2736+736=3436=1718\frac{3}{4} + \frac{7}{36} = \frac{27}{36} + \frac{7}{36} = \frac{34}{36} = \frac{17}{18}

 

 

(5814)÷(34+12)( \frac{5}{8} - \frac{1}{4} )÷( \frac{3}{4} + \frac{1}{2} )

先分别算括号内运算:

5814=5828=38\frac{5}{8} - \frac{1}{4} = \frac{5}{8} - \frac{2}{8} = \frac{3}{8}

34+12=34+24=54\frac{3}{4} + \frac{1}{2} = \frac{3}{4} + \frac{2}{4} = \frac{5}{4}

 

再算除法:38÷54=38×45=310\frac{3}{8}÷\frac{5}{4} = \frac{3}{8}×\frac{4}{5} = \frac{3}{10}

 

 

23×[(34+16)÷58]\frac{2}{3}×[ ( \frac{3}{4} + \frac{1}{6} )÷\frac{5}{8} ]

先算小括号内加法:34+16=912+212=1112\frac{3}{4} + \frac{1}{6} = \frac{9}{12} + \frac{2}{12} = \frac{11}{12}

再算中括号内除法:\(\frac{11}{12}÷\frac{5}{8} = \frac{11}{12}