11 * (6 / 7 + 1) - 4 / 7 * 13 by simple method Don't just copy one from another. Explain why. Explain every step | Math enthusiast | Mathematical art

11 * (6 / 7 + 1) - 4 / 7 * 13 by simple method Don't just copy one from another. Explain why. Explain every step

11*（6/7+1）-4/7*13
=11 * 13 / 7 - (4 * 13) / 7
=11 * 13 / 7-4 * 13 / 7
=(11-4) * 13 / 7
=7*13/7
=13

20 divided by 8 / 9 divided by 3 / 4

20÷8/9÷3/4
=20÷（8/9×3/4）
=20÷2/3
=30

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