3²/2×4+5²/4×6+7²/6×8+9²/8×10+11²/10
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:2024/07/31 03:41:14
3²/2×4+5²/4×6+7²/6×8+9²/8×10+11²/10×12=?简便算法
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![3²/2×4+5²/4×6+7²/6×8+9²/8×10+11²/10](/uploads/image/z/8322938-26-8.jpg?t=3%26%23178%3B%2F2%C3%974%2B5%26%23178%3B%2F4%C3%976%2B7%26%23178%3B%2F6%C3%978%2B9%26%23178%3B%2F8%C3%9710%2B11%26%23178%3B%2F10)
3²/2×4+5²/4×6+7²/6×8+9²/8×10+11²/10×12
=5+1/2×4+1/4×6+1/6×8+1/8×10+1/10×12
=5+(1/2-1/4+1/4-1/6+1/6-1/8+1/8-1/10+1/10-1/12)÷2
=5+(1/2-1/12)÷2
=5+5/24
=5又5/24
=5+1/2×4+1/4×6+1/6×8+1/8×10+1/10×12
=5+(1/2-1/4+1/4-1/6+1/6-1/8+1/8-1/10+1/10-1/12)÷2
=5+(1/2-1/12)÷2
=5+5/24
=5又5/24
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
简便运算:10²-9²+8²-7²+6²-5²+4²
2²/1*3+4²/3*5+6²/5*7+8²/7*9+10²/9*1
10²-9²+8²-7²+6²-5²+4²-3
10²-9²+8²-7²+6²-5²+4²-3
(2²+4²+6²+8²+10²)-(1²+3²+
(1-2²)+3²-4²+5²-6²+7²-8²+
1²-2²+3²-4²+5²-6²+7²-8
1×3分之2²+3×5分之4²+5×7分之6²+7×9分之8²+9×11分之10
1.2² 4² 6² 8² 10²