能簡算就簡算36%÷9/10-0.36×8/9 36×25%+0.25×40

能簡算就簡算36%÷9/10-0.36×8/9 36×25%+0.25×40


36%÷9/10-0.36×8/9
=36%×10/9-0.36×8/9
=0.36×(10/9-8/9)
=0.36×2/9
=0.08
36×25%+0.25×40
=(36+40)÷4
=76÷4
=19



0.2/(6/1+6/5/9/10)簡算


0.2/(6/1+6/5/9/10)
=1/5÷(6+6/5×10/9)
=1/5÷(6+4/3)
=1/5÷22/3
=1/5×3/22
=3/110



(3/5*12+3*0.6)*9/10簡算


(3/5*12+3*0.6)*9/10=(0.6*12+3*0.6)*9/10=[0.6*(12+3)]9/10=9*9/10=8.1