用简便方法计算下列各题. 0.65×201 7.8×6.9+2.2×6.9 1.25×6.3×0....
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发布时间：2024-09-27 14:31
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时间：2024-10-05 16:40
=0.65×（200+1）
=0.65×200+0.65×1
=130+0.65
=130.65
（2）7.8×6.9+2.2×6.9
=（7.8+2.2）×6.9
=10×6.9
=69
（3）1.25×6.3×0.8
=1.25×0.8×6.3
=1×6.3
=6.3
