题目内容
计算:1×(1+3)+2×(2+3)+…+10×(10+3)=______.
原式=1×1+2×2+3×3+…+10×10+(1+2+…+10)×3,
=10×(10+1)×
+10×(10+1)×
,
=5×7×11+5×11×3,
=5×11×(7+3),
=55×10,
=550.
故答案为:550.
=10×(10+1)×
| 2×10+1 |
| 6 |
| 3 |
| 2 |
=5×7×11+5×11×3,
=5×11×(7+3),
=55×10,
=550.
故答案为:550.
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