题目内容
计算:71
×
+61
×
+51
×
+41
×
+31
×
=______.
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:71
×
+61
×
+51
×
+41
×
+31
×
,
=(70+
)×
+(60+
)×
+(50+
)×
+(40+
)×
+(30+
)×
,
=60+1+50+1+40+1+30+1+20+1,
=205.
故答案为:205.
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=(70+
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=60+1+50+1+40+1+30+1+20+1,
=205.
故答案为:205.
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