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Use a simple method to calculate the following questions, and check them. 580 ／ 20 760 ／ 60 1000 ／ 300

Use a simple method to calculate the following questions, and check them. 580 ／ 20 760 ／ 60 1000 ／ 300

580÷20 =58/2=29
760/60=76/6=38/3
1000/300=10/3

Calculate the following questions and check that 2 / 3-1 / 2 = 5 / 6 × 4 / 7 = 3.85 * 4.2 = 3182 / 37=
It's separate

2/3-1/2
=4/6-3/6
=1/6
5/6×4/7
=5/3×2/7
=10/21
3.85*4.2
=16.17
3182/37
=86

Calculate the following questions and check them with the law of exchange between China and France. 38 + 456307 + 348123 + 2847

494,655,2970