420 580-64×21÷28简便计算?

2025-04-30 04:45:20
推荐回答(2个)
回答1:

420+580-64×21÷28
=1000-64÷4÷7×21
=1000-16×21÷7
=1000-336÷7
=1000-48
=952
满意望采纳

回答2:

420+ 580-64×21÷28
=1000-64x21÷(4x7)
=1000-(64÷4)x(21÷7)
=1000-16x3
=1000-48
=952