Question

脱式计算能解算的要简算 (1/2+5/6一1/3)÷5/12 1.2×0.8×4×9？

Answer 1

脱式计算是一个数学学科术语，即递等式计算，把计算过程完整写出来的运算，也就是脱离竖式的计算。
（1）(1/2+5/6-1/3)÷5/12
=(3/6+5/6-2/6)÷5/12
=(8/6-2/6)÷5/12
=1÷5/12
=1×12/5
=12/5
=2.4。
（2）1.2×0.8×4×9
=0.96×4×9
=(1-0.04)x36
=1x36-0.04x36
=36-1.44
=34.56。
=34.56

Answer 2

(1/2+5/6-1/3)÷5/12
=(3/6+5/6-2/6)÷5/12
=(8/6-2/6)÷5/12
=1÷5/12
=1×12/5
=12/5
=2又2/5

1.2×0.8×4×9
=0.96×4×9
=3.84×9
=34.56

Answer 3

（1/2+5/6-1/3）÷5/12
＝（1/2+5/6-1/3）×12/5
＝1/2×12/5+5/6×12/5-1/3×12/5
＝6/5+2-4/5
＝6/5-4/5+2
=2.4