三、简便计算（延伸阅读：四年级数学上册乘法简便运算练习题、竖式：三位数乘两位数135X45108255431247210138X54126892033231225437X28824032082436137406X2346023305566247846X5893535645240479855\n三、简便计算（延伸阅读：四年级数学上册乘法简便运算练习题、竖式：三位数除以两位数、验算336+21858399182788837645+32432469662373179980+28828366893461888372+45294293284239556765+748403563031961195\n三、简便计算（延伸阅读：四年级数学上册乘法简便运算练习题及答案）578+143+22+57128+89+721.加法交换结合律:48+25+1755三、简便计算（延伸阅读：四年级数学上册乘法简便运算练习题5三、简便计算（延伸阅读：四年级数学上册乘法简便运算练习题357+288+143129+235+171+165378+527+73167+289+3358+39+42+6175+34+125+366125+75+320153+38+162163+32+137+2685三、简便计算（延伸阅读：四年级数学上册乘法简便运算练习题5\n三、简便计算（延伸阅读：四年级数学上册乘法简便运算练习题158+395+105822+197+785三、简便计算（延伸阅读：四年级数学上册乘法简便运算练习题5\n三、简便计算（延伸阅读：四年级数学上册乘法简便运算练习题2.乘法交换结合律（一）25X125X32=(15X25)X4=38X25X4=3525=(60X25)X4=(125X5)X8=25X17X4=(25X125)x(8X4)=3812583=5X289X2=125582=98125=43254=125502=421258=60X25X4=12558=25174=378125=5\n3.乘法交换结合律（二）12532241251255612572125164812512564253625322516252425284.乘法分配律（一）：34X72+34X287X48+7X5235X37+65X37#3.乘法交换结合律（二）#3.乘法交换结合律（二）85X82+82X1525X97+25X376X25+25X24#3.乘法交换结合律（二）#\n16X17+16X2327X36+27X6473X36+36X2764X23+36X2343X36+57X3619X67+19X33716X17+16X2327X36+27X6473X36+36X27716X17+16X2327X36+27X6473X36+36X2757X35+43X3518X72+72X18246X46+46X54716X17+16X2327X36+27X6473X36+36X27716X17+16X2327X36+27X6473X36+36X2731X69+31X3134X13-34X3716X17+16X2327X36+27X6473X36+36X27716X17+16X2327X36+27X6473X36+36X275.乘法分配律（二）：38X99+3875X299+75102X99+1027\n39+9X3999X128+12827+99X27#39+9X3999X128+12827+99X2734+199X3435X99+356.乘法分配律(三)：125X(8+80)(20+4)X25(80+4)X2532X(200+3)(100+2)X99102X(100—1)8X(125+9)(125+17)X825X(40+4)(25+100)X499X(100+1)(125+40)X8#\n(125+25)X899X(100+7)8X(125+7)7.乘法分配律（四）：9999461024246X10248X10199103X31107161081512588998810210299391012541994810120124302431021399\n8.商不变的规律:300+254000+125240+5600+253200+50400+25150+25800+2520001259000+12599四、混合运算（延伸阅读：小学四年级数学上册复习试题）99672—672+12X7987+(345-298)X65210X[520+(240—227)]340—240+20X59\n30X(320—170)+90[458—(85+28)]+231313630X[840+(240—212)]408+[512—(178+283)]1313864+[(27—23)X12](105X12—635)+251313240—140+5X3360—260+20X51313104X48+272+1635+65+5—2013\n240+180+30X2450+30+20X3146—(34+420+70)624+[(27—14)X4]#240+180+30X2450+30+20X3#240+180+30X2450+30+20X3(77—21+7)X691(165—65+5)X5#240+180+30X2450+30+20X3#240+180+30X2450+30+20X3840+[(120+195)+15][557—(186+26)]+23(375+(25—10)X1515X27-200+8#\n324-285)X12+26(160—48+12)X413324-285)X12+26(160—48+12)X4336-[(36—29)X6]62X(300—145+5)35X(320-170)+50(36X54—984)24150+[90+(67—52)]659-34?(280740)182+[36+(12+6)]640+[(96-80)4]13