10²-9²+8²-7²+6²-5²+4²-3
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/07/11 20:32:40
10²-9²+8²-7²+6²-5²+4²-3²+2²-1²咋做呀
![10²-9²+8²-7²+6²-5²+4²-3](/uploads/image/z/5337460-28-0.jpg?t=10%26%23178%3B-9%26%23178%3B%2B8%26%23178%3B-7%26%23178%3B%2B6%26%23178%3B-5%26%23178%3B%2B4%26%23178%3B-3%26%23)
(10-9)(10+9)+(8-7)(8+7)+……+(2-1)(2+1)
=10+9+8+……+2+1
=(10+1)*10/2
=55
=10+9+8+……+2+1
=(10+1)*10/2
=55
10²-9²+8²-7²+6²-5²+4²-3
简便运算:10²-9²+8²-7²+6²-5²+4²
10²-9²+8²-7²+6²-5²+4²-3
10²-9²+8²-7²+6²-5²+4²-3
(1-2²)+3²-4²+5²-6²+7²-8²+
1²-2²+3²-4²+5²-6²+7²-8
2²/1*3+4²/3*5+6²/5*7+8²/7*9+10²/9*1
3²/2×4+5²/4×6+7²/6×8+9²/8×10+11²/10
计算:3²/2×4+5²/4×6+7²/6×8+9²/8×10+11²
10²-9²+8²-7²+6²-5²+4²-3
(2²+4²+6²+8²+10²)-(1²+3²+
2²/1×3+4²/3×5+6²/5×7+8²/7×9+...+20²