8/15×2又1/2÷(6又2/3×0.28+6又2/3×72%)等于多少?

8/15×2又1/2÷(6又2/3×0.28+6又2/3×72%)等于多少?
8/15×2又1/2÷(6又2/3×0.28+6又2/3×72%)等于多少?

8/15×2又1/2÷(6又2/3×0.28+6又2/3×72%)等于多少?
8/15×2又1/2÷(6又2/3×0.28+6又2/3×72%)
=8/15×5/2÷[6又2/3×（0.28+0.72）]
=4/3÷6又2/3
=4/3×3/20
=1/5

8/15×2又1/2÷(6又2/3×0.28+6又2/3×72%)
=8/15×2又1/2÷【6又2/3×（0.28+72%)】
=4/3÷6又2/3
=1/51/4×0.84-0.26×25%+0.42÷4等于多少？1/4×0.84-0.26×25%+0.42÷4 =1/4×（0.84-0.26+0.42） =1/4×1 =1/41又1/2+2又1/6+3又1/12...

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8/15×2又1/2÷(6又2/3×0.28+6又2/3×72%)
=8/15×2又1/2÷【6又2/3×（0.28+72%)】
=4/3÷6又2/3
=1/5

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