15.2×7.8+2.2×15.2的简便算法
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15.2×7.8+2.2×15.2的简便算法
15.2×7.8+2.2×15.2的简便算法
15.2×7.8+2.2×15.2的简便算法
=15.2×(7.8+2.2)
=15.2×10
=152
15.2×7.8+2.2×15.2
=15.2×(7.8+2.2)
=15.2×10
=152
15.2×7.8+2.2×15.2的简便算法
15.2×7.8+2.2×15.2的简便算法
15.2×7.8+2.2×15.2的简便算法
=15.2×(7.8+2.2)
=15.2×10
=152
15.2×7.8+2.2×15.2
=15.2×(7.8+2.2)
=15.2×10
=152