2.8x35 28x6.5用脱式计算能简便的就简便?

2024-11-25 05:23:23
推荐回答(2个)
回答1:

原式
=2.8x35+2.8x65
=2.8x(35+65)
=2.8x100
=280

回答2:

2.8×35+28×6.5
=2.8×35+2.8×65
=2.8×(35+65)
=2.8×100
=280