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1、速算秘诀10 *.f召速算秘诀10大招(3)解:117 + 529 + 383 + 471 + 228 + 372 117 + 529 + 383 + 471 + 228 + 372 = (117 + 383) + (529 + 471) + (228 + 372) = 500 + 1000 + 600=2100分组凑整法g霆计算:(1) 489 + 508 + 504 + 496 + 499 + 503 + 502 + 511 = ()A.3998B.4005C.4010D.4012(2) 9 + 98 + 996 + 9997 = ()A.11111B.11110C.11100(3) 27
2、562748 + 1748 + 244 = ()A.1000B.2000C.3000D.11000D.4000酝3速算秘诀10大招= 0.625 X (280 - 130 + 225) - 0.375 X 525 = 0.625 X 375 - 0.375 X 525 = 625 X 0.375 - 0.375 X 525 = 0.375 X (625 - 525) = 0.375 X 100 发现: 有出现相同的因数0.375,再二次提取0.375.= 37.5 g垦,计算: 99 + 99 X 99 + 99 X 99 X 99 酝9即重叠数的速算 1. abcabc = abc x 10012. abcdabcd = abed x 100013. abcabcabc = abc X 1001001e曰l计算:(1)解:203 X 202202 - 202 X 203203203 X 202202 - 202 X 203203= 203 X 1001 X 202 - 202 X 1001 X 203 =O20