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计算
$125 + 775 =$ $400×50 =$ $0.62 + 0.38 =$
$700÷4 =$ $670 + 130 =$ $2.14 + 6.86 =$
$4.6 + 5.4 =$ $0.21 + 0.79 =$ $1 - 0.08 =$
$100 - 0.82 =$ $125×8 =$ $0.5 - 0.47 =$
$780 - 260 =$ $590 - 129 =$ $1 - 0.52 =$
$890 + 110 =$ $334 + 189 =$ $3 - 2.47 =$
$99 + 9.9 =$ $60÷4÷5 =$ $0.1 - 0.07 =$
$240×5 =$ $46 - 37 + 54 =$ $4 - 0.94 =$
$7200÷800 =$ $7 - 0.7 - 0.3 =$ $0.2 - 0.08 =$
$0.85 + 1.5 =$ $780 - 99 =$ $1.33 + 0.67 =$
$100÷4÷5 =$ $820 + 990 =$ $4.56 + 0.44 =$
$180 - 35 - 65 =$ $24×50 =$ $7.34 + 2.66 =$
$5 - 3.6 - 0.4 =$ $920 - 250 =$ $4.15 + 5.85 =$
$300÷4 =$ $720÷9 =$ $0.47 + 0.53 =$
$0.86 + 0.14 =$ $85 - 14 + 15 =$ $0.47 + 9.53 =$
$21 + 79 - 21 =$ $700÷5÷7 =$ $0.1 - 0.09 =$
$480×5 =$ $180×5×4 =$ $0.2 - 0.17 =$
$290 + 129 =$ $5 - 1.38 =$ $3.24 + 1.76 =$
$125 + 775 =$ $400×50 =$ $0.62 + 0.38 =$
$700÷4 =$ $670 + 130 =$ $2.14 + 6.86 =$
$4.6 + 5.4 =$ $0.21 + 0.79 =$ $1 - 0.08 =$
$100 - 0.82 =$ $125×8 =$ $0.5 - 0.47 =$
$780 - 260 =$ $590 - 129 =$ $1 - 0.52 =$
$890 + 110 =$ $334 + 189 =$ $3 - 2.47 =$
$99 + 9.9 =$ $60÷4÷5 =$ $0.1 - 0.07 =$
$240×5 =$ $46 - 37 + 54 =$ $4 - 0.94 =$
$7200÷800 =$ $7 - 0.7 - 0.3 =$ $0.2 - 0.08 =$
$0.85 + 1.5 =$ $780 - 99 =$ $1.33 + 0.67 =$
$100÷4÷5 =$ $820 + 990 =$ $4.56 + 0.44 =$
$180 - 35 - 65 =$ $24×50 =$ $7.34 + 2.66 =$
$5 - 3.6 - 0.4 =$ $920 - 250 =$ $4.15 + 5.85 =$
$300÷4 =$ $720÷9 =$ $0.47 + 0.53 =$
$0.86 + 0.14 =$ $85 - 14 + 15 =$ $0.47 + 9.53 =$
$21 + 79 - 21 =$ $700÷5÷7 =$ $0.1 - 0.09 =$
$480×5 =$ $180×5×4 =$ $0.2 - 0.17 =$
$290 + 129 =$ $5 - 1.38 =$ $3.24 + 1.76 =$
答案
（按照题目顺序依次给出答案）900；20000；1；175；800；9；10；1；0.92；99.18；1000；0.03；520；461；0.48；1000；523；0.53；108.9；3；0.03；1200；63；3.06；9；6；0.12；2.35；681；2；5；1810；5；80；1200；10；1；670；10；75；80；1；1；86；10；79；20；0.01；2400；3600；0.03；419；3.62；5。
解析
1.125 + 775 =900；
2.400×50 =20000；
3.0.62 + 0.38 =1；
4.700÷4 =175；
5.670 + 130 =800；
6.2.14 + 6.86 =9；
7.4.6 + 5.4 =10；
8.0.21 + 0.79 =1；
9.1 - 0.08 =0.92；
10.100 - 0.82 =99.18；
11.125×8 =1000；
12.0.5 - 0.47 =0.03；
13.780 - 260 =520；
14.590 - 129 =461；
15.1 - 0.52 =0.48；
16.890 + 110 =1000；
17.334 + 189 =523；
18.3 - 2.47 =0.53；
19.99 + 9.9 =108.9；
20.60÷4÷5 =30÷5 = 3÷ 5?（原式可看作（60÷4）÷5=15÷5=3（或60÷4÷5 = 60÷(4×5)=60÷20 = 3））；21.0.1 - 0.07 =0.03；22.240×5 =1200；23.46 - 37 + 54 =9+54 = 63?（按照从左到右顺序计算，先算46 - 37 = 9，再算9 + 54 = 63）；
24.4 - 0.94 =3.06；
25.7200÷800 =9；
26.7 - 0.7 - 0.3 =7-(0.7 + 0.3)=7 - 1=6；
27.0.2 - 0.08 =0.12；
28.0.85 + 1.5 =2.35；
29.780 - 99 =780-(100 - 1)=780 - 100+1 = 681；
30.1.33 + 0.67 =2；
31.100÷4÷5 =100÷(4×5)=100÷20 = 5；
32.820 + 990 =1810；
33.4.56 + 0.44 =5；
34.180 - 35 - 65 =180-(35 + 65)=180 - 100 = 80；
35.24×50 =1200；
36.7.34 + 2.66 =10；
37.5 - 3.6 - 0.4 =5-(3.6 + 0.4)=5 - 4 = 1；
38.920 - 250 =670；
39.4.15 + 5.85 =10；
40.300÷4 =75；
41.720÷9 =80；
42.0.47 + 0.53 =1；
43.0.86 + 0.14 =1；
44.85 - 14 + 15 =71+15 = 86?（按照从左到右顺序计算，先算85 - 14 = 71，再算71+15 = 86）；45.0.47 + 9.53 =10；46.21 + 79 - 21 =(21 - 21)+79 = 79；47.700÷5÷7 =700÷(5×7)=700÷35 = 20；48.0.1 - 0.09 =0.01；49.480×5 =2400；50.180×5×4 =180×(5×4)=180×20 = 3600；51.0.2 - 0.17 =0.03；52.290 + 129 =419；53.5 - 1.38 =3.62；54.3.24 + 1.76 =5。
2.400×50 =20000；
3.0.62 + 0.38 =1；
4.700÷4 =175；
5.670 + 130 =800；
6.2.14 + 6.86 =9；
7.4.6 + 5.4 =10；
8.0.21 + 0.79 =1；
9.1 - 0.08 =0.92；
10.100 - 0.82 =99.18；
11.125×8 =1000；
12.0.5 - 0.47 =0.03；
13.780 - 260 =520；
14.590 - 129 =461；
15.1 - 0.52 =0.48；
16.890 + 110 =1000；
17.334 + 189 =523；
18.3 - 2.47 =0.53；
19.99 + 9.9 =108.9；
20.60÷4÷5 =30÷5 = 3÷ 5?（原式可看作（60÷4）÷5=15÷5=3（或60÷4÷5 = 60÷(4×5)=60÷20 = 3））；21.0.1 - 0.07 =0.03；22.240×5 =1200；23.46 - 37 + 54 =9+54 = 63?（按照从左到右顺序计算，先算46 - 37 = 9，再算9 + 54 = 63）；
24.4 - 0.94 =3.06；
25.7200÷800 =9；
26.7 - 0.7 - 0.3 =7-(0.7 + 0.3)=7 - 1=6；
27.0.2 - 0.08 =0.12；
28.0.85 + 1.5 =2.35；
29.780 - 99 =780-(100 - 1)=780 - 100+1 = 681；
30.1.33 + 0.67 =2；
31.100÷4÷5 =100÷(4×5)=100÷20 = 5；
32.820 + 990 =1810；
33.4.56 + 0.44 =5；
34.180 - 35 - 65 =180-(35 + 65)=180 - 100 = 80；
35.24×50 =1200；
36.7.34 + 2.66 =10；
37.5 - 3.6 - 0.4 =5-(3.6 + 0.4)=5 - 4 = 1；
38.920 - 250 =670；
39.4.15 + 5.85 =10；
40.300÷4 =75；
41.720÷9 =80；
42.0.47 + 0.53 =1；
43.0.86 + 0.14 =1；
44.85 - 14 + 15 =71+15 = 86?（按照从左到右顺序计算，先算85 - 14 = 71，再算71+15 = 86）；45.0.47 + 9.53 =10；46.21 + 79 - 21 =(21 - 21)+79 = 79；47.700÷5÷7 =700÷(5×7)=700÷35 = 20；48.0.1 - 0.09 =0.01；49.480×5 =2400；50.180×5×4 =180×(5×4)=180×20 = 3600；51.0.2 - 0.17 =0.03；52.290 + 129 =419；53.5 - 1.38 =3.62；54.3.24 + 1.76 =5。
