简便计算
2/3+1/3X3/4 4X8X1.25X1/4
1/2-8/9÷5/6X3/16 3/5X(1/7+8/21÷2/3)
(1/69+2/71)x23+25/71 14/25÷[1-(1/5+1/3)]
请给过程。上面两道是方程,之后的是简便计算,速度
请给过程
给过程
追答2/3+1/3X3/4 =2/3+1/4= 8/12+3/12=11/12 *是乘号
4X8X1.25X1/4=32*1.25*0.25=10
1/2-8/9÷5/6X3/16 =1/2-8/9* 6/5*3/16=1/2-1/5=5/10-2/10=3/10
3/5X(1/7+8/21÷2/3)=3/5*(1/7+8/21*3/2)=3/5*(1/7+4/7)=3/5*5/7=3/7
(1/69+2/71)x23+25/71 =69/23+23*2/71+25/71= 69/23+1= 69/23+69/69=92/39=4/3
14/25÷[1-(1/5+1/3)]=14/25÷[1-(3/15+5/15)]=14/25÷[1-8/15}=14/25÷7/15=14/25÷15/7=6/5