1.脱式计算(能简算的要简算) 1.7-0.81+1.3-0.19 .2/3/(2/3+1/4)

问题描述:

1.脱式计算(能简算的要简算) 1.7-0.81+1.3-0.19 .2/3/(2/3+1/4)

原式1=1.7+1.3-(0.81+0.19)=3-1=2
2/3÷(2/3+1/4)=2/3÷11/12=2/3x12/11=8/11

1.7-0.81+1.3-0.19
=(1.7+1.3)-(0.81+0.19)
=3-1
=2
2/3/(2/3+1/4)
=8/(8+3) (分子分母同时×12)
=8/11