7.8×9.9+0.78=?(简算)

2024-12-03 09:33:50
推荐回答(3个)
回答(1):


看埋猛氏弯散知饥

回答(2):

=7.8×9.9+7.8×0.1
=7.8×(9.9+0.1)
=7.8×10
=78

回答(3):

=7.8X9.9+7.8X0.1
=7.8X(9.9+0.1)
=7.8X10
=78