3.56×38.5+0.7×356+9.15×35.6=3.56×38.5+70×3.56+91.5×3.56=3.56×（38.5+70+91.5）=3.56×200=712
3.56×38.5+0.7×356+9.15×35.6=35.6×3.85+7×35.6+9.15×35.6=35.6×(3.85+7+9.15)=35.6×20=712
