If you can make a simple calculation, you can make a simple calculation

If you can make a simple calculation, you can make a simple calculation

4 / 7 x 3 / 5 + 2 / 5 x 4 / 7
=4X of 7 (3 of 5 + 2 of 5)
=4x1 / 7
=4 out of 7

8 / 21 (- 4 / 7) × (- 1 / 2)
(- 1) & # 178; - (1-0.5) / {1 / 3 × [2 - (- 3) square]}

A:
1）
8 / 21 (- 4 / 7) × (- 1 / 2)
=(8/21)×(-7/4)×(-1-1/2)
=-(2/3)×(-3/2)
=1
2）
(- 1) & # 178; - (1-0.5) / {1 / 3 × [2 - (- 3) square]}
=1-0.5÷[(1/3)×(2-9)]
=1-(1/2)÷[(1/3)×(-7)]
=1-(1/2)÷(-7/3)
=1-(1/2)×(-3/7)
=1+3/14
=17/14

-21.8 + 4 - (- 7.4) + (- 3 / 5) solving process
Simple method

-21.8 + 4 - (- 7.4) + (- 3 / 5)
=-21.8+4-7.4-0.6
=-21.8+4-8
=-25.8；
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