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If you can calculate simply, you can calculate simply 36% △ 9 / 10-0.36 × 8 / 9 36×25%+0.25×40

If you can calculate simply, you can calculate simply 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

2 / (6 / 1 + 6 / 5 / 9 / 10)

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 simple calculation

(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