(31.6 minus 11.7) in addition to 2.5 divided by 0.4, there is a formula of 3.75 times 99

Simple calculation of 1 + 9 + 2 + 8 + 3 + 7 + 4 + 6 + 5 + 5

=（1+9）+（2+8）+（3+7）+（4+6）+（5+5）
=10+10+10+10+10
=50

3 × (2 / 15 + 1 / 12) - 2 / 5, can it be calculated simply

3×（2/15+1/12）-2/5
=3×2/15+3×1/12-2/5
=2/5-2/5+1/4
=1/4

What can be calculated simply should be (2-3 / 4 × 4 / 5) / (1 / 12 + 4 / 15)

（2－3/4×4/5）÷（5/60+16/60)=(7/5)X(60/21)=4

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