1 30*(40%)/(2/3)=18
2 8+2/5-1/2*(3+1/3)=8+2/5-5/3=101/15
(1+1/4)*17.6+22.4/(4/5)=5/4*(17.6+22.4)=50
1.列式计算,不能用方程.2.简便计算（写出过程,能简便就简便.）
1 30*(40%)/(2/3)=18
2 8+2/5-1/2*(3+1/3)=8+2/5-5/3=101/15
(1+1/4)*17.6+22.4/(4/5)=5/4*(17.6+22.4)=50