117/3×5/11+5/23×4/17

3/5×3.7+3.6+6.3×3/5
=3/5×（3.7+6.3）+3.6
=3/5×10+3.6
=6+3.6
=9.6
（3/4×7.2+2.8×0.75）÷1.5
=[3/4×（7.2+2.8）]×2/3
=3/4×2/3×10
=1/2×10
=5
6/11÷（1