1、479 X 85二、竖式:三位数除以两位数、,验算3362185839 91827 888-374324696623731 7998028828 36689 3461888645 3237245294293284239556840 3563031961 1976574三、简便计算1.加法交换结合律:48+25+175153+38+162167+289+33125+75+32057+288+14358+ 39+42+61822+197+78578+143+22+57128+ 89+72 3378+ 527+73158+395+10575+ 34+125+366129+235+171 + 1651
2、63+ 32+137+2682.乘法交换结合律(一): 25X 125X 32 (15X25) X4 38X 25X435X2X560X25)5 4 (125X5) X 8 25X 17X4 /(25X 125) X (8X4) 38X 125X8X3 5X289X2125X 5X8X2 9X 8X 125 43X25X4125X50X242X125X860X25X4125X5X825X 17X437X8X1253.乘法交换结合律(二)125X32 24X 125 125X56 125X7248X 125 125 X64 25X36 25X3225X 16 25X 24 25X28 125X
3、164.乘法分配律(一)34X72+34X2885X82+82X 1525X97+25X327X36+27X6443X36+57X367X48+7X5276X25+25X2473X36+36X2719X67+19X3335X37+65X3716X17+16X2364X23+36X2357X35+43X3518X 72+ 72X 182 46X 46+ 46X54 31 X 69+ 31 X 3134X13-34X35.乘法分配律(二)38X99+ 38 75X 299+ 75 102X 99+ 1026.乘法分配律(三)78X(125+7) (30+25) X48.乘法分配律(四)9201X2
4、4 302X43 102X 13 48X 1018.商不变的规律:300254000125240+5600253200- 504002515025800252000 125 9000 125队混合运算672672+ 12X7 987+ (345 298) X 65210X 520 + (240 227) 340 240 +20X530 X (320 170)+90458 (85+28)+ 23630X 840 +(240212)408+ 512-(178+283)864+ (27-23)X12(105X 12635)+25240 140+ 5X3360 260-20X5104X48+272-
5、1635+ 65+520240+ 180+ 30X2450+ 30+20X3146 (34 +420- 70)624+ (2714)X4(77 21 + 7)X691(16565+5)X5840+ (120+195)+15557-(186+ 26) +23375+ (2510) X 1515X 27-200+ 8(324-285) X 12 -26(160 48+12) X4336+ (3629) X 662X (300145+ 5)35 X (320-170) +50(36X54-984) +24150+ 90 + (6752)182+36+ (12+6)640+ (96-80) X4840+ (120 + 195)+15557-(186+26)-23336+ (3629) X 6182+ 36+ (12+6)
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