7.8×49+78×3.8+7.8×130简算

7.8×49+78×3.8+7.8×130简算拜托了各位
2025-04-02 10:07:30
推荐回答(2个)
回答1:

解:
7.8×49+78×3.8+7.8×130
=7.8×49+7.8×38+7.8×130
=7.8×(49+38+130)
=7.8×217
=7.8×200+7.8×17
=1560+132.6
=1692.6

回答2:

7.8×49+78×3.8+7.8×130
=7.8x(49+38+130)
=7.8x217
=8x217-0.2x217
=1736-43.4
=1692.6