日志
四年级奥数题及答案：巧算3（中等难度）问题
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巧算3：(中等难度)
计算：3.42×76.3+7.63×57.6+9.18×23.7.
巧算3答案：
3.42×76.3+7.63×57.6+9.18×23.7
=7.63×（34.2+57.6）+9.18×23.7
=7.63×91.8+91.8×2.37
=(7.63+2.37) ×91.8
=10×91.8
=918
计算：3.42×76.3+7.63×57.6+9.18×23.7.
3.42×76.3+7.63×57.6+9.18×23.7
=7.63×（34.2+57.6）+9.18×23.7
=7.63×91.8+91.8×2.37
=(7.63+2.37) ×91.8
=10×91.8
=918
