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25X16X5简便计算

25x16x5 = (25×4)×(4×5) = 100 ×20 = 2000

25×16×5 =(25×4)×(4×5) =100×20 =2000 你好,本题已解答,如果满意,请点右上角“采纳答案”,支持一下。

原式 =(25x4)x(16x5) =100x8x2x5 =800x10 =8000

25X5X16 =(25×4)×(5×4) =100×20 =2000

53x54十54x16+69x25+21x69 =54×(53+16)+69×(25+21) =54×69+69×46 =69×(54+46) =69×100 =6900

(25-15)×16 (20×5)×(7×3) 35×(100-1) 24×(100+2) 25×4×2+4

1x5+4=9=3², 2x6+4=16=4², 3x7+4=25=5², 4x8+4=36=6², 利用规律计算 99x103+4=[(99+103)/2]²=101²=10201 望采纳,若不懂,请追问。

a1=x^3/4 a2=x^5/9 a3=x^7/16 a4=x^9/25 a5=x^11/36 a6=x^13/49 a7=x^15/64 a8=x^17/81 ....... An=X^(2n+1)/(n+1)^2

971364852 526918374 438275916 765423189 193786245 842159637 257631498 389542761 614897523

原式 =1.25x5.6+2.5x3.6-0.25x3.6 =1.25x8x0.7+2.5x4x0.9-0.25x4x0.9 =10x0.7+10x0.9-1x0.9 =7+9-0.9 =16-0.9 =15.1 供参考。

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