小学四年级数学简便运算专项练习400题

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1、小学四年级数学简便运算专项训练400题加法交换律：a+b=b+a加法结合律：(a+b)+c=a+(b+c)乘法交换律：aXb=bXa乘法结合律：(aXb)Xc=aX(bXc)乘法分配律：(a+b)Xc=aXc+bXc或aX(b+c)=aXb+aXc减法的性质：a—b—c=a—(b+c)带着加减号搬家:+ba—b+c=a+c—ba+b—c=a—c怎么简便怎么算：★(23+56)+4725X277X4125X(3+8)462-83-1178X(30X125)3200^25^4★★425-38+755246-(246

2、+694)25X6+25X4360一(18X4)32X105598+735★★★99X38+3898X3425+75-25+7548X1255404-45103X56127+352+73+4489+276+135+33165+204+335+9625+71+75+29+88243+89+111+57399+(154+201)480+325+7578+53+47+2291+89+1136+18+64168+250+3285+41+15+5978+46+154130-46-34263-96-104472-126-1

3、24168-28-72970-132-68437-137-63400-185-15244+182+56200-173-27124+68+76263-96-104970-132-68527+199735-198105X99865-19875X9868X99+6863X88+88X3758X99+5825X49+75X49575-78-2248X89+48367-19956X10275X48+75X52(20+4)X2599X1132X(200+3)68X39+68239X10138X25X442X125X8(25

4、X125)X8X478X125X8X3(125X25)X4(125+25)X4127+352+73+489+276+135+335+204+335+9625+71+75+29+88243+89+111+57399+(154+201)480+325+7578+53+47+2291+89+1136+18+64168+250+3285+41+15+5978+46+154130-46-34263-96-104970-132-68400-185-15472-126-124168-28-72437-137-63244+18

5、2+56200-173-27124+68+76263-96-104970-132-68400—185—15472-126-124603+421745-305951-39519+199+199934+304+3004798+321325-156+675-1448+98+998+999899999+9999+999+99+9+444+37+56163+49+26174+(137+326)249+402189+35+211+165483-236-64582-157-18265X5X215X23X436X2525X12

6、5X3235X225X(63X2)540F45F25404-36216+30525X3247+236+646X(15X9)402+35943+78+122+25725X(26X4)25X44354+(229+46)25X(4X12)25X(4+12)64X64+36X6499X99+9949X99+4949X99+49(1)a+b=b+a88+56+12178+350+2256+208+144(2)(a+b)+c=q+(b+c)(23+56)+47286+54+46+4582+456+544(3)aXb=bXa

7、25X37X475X39X465X11X4125X39X16(4)(aXb)Xc=aX(bXc)19X75X862X8X2543X15X641X35X2(5)aX(b+c)=aXb+aXc136X406+406X64702X123+877X702246X32+34X492(6)aX(b—c)=aXb—aXc102X59-59X2456X25-25X5643X126-86X13101X897-897(7)a—b—c=a—(b+c)458-45—1552354-456-54468547-457-123-420(8)

8、a—b+c=a+c—b4235-4067+7653569+526-156945682-7538+14318(9)a4-b4-c=a4-(bXc)4500*4*7516800^8^25248000一8一12552004-44-65(10)a4-bXc=aXc4-b4500X102H-903600—80X2125H-20X82504-75X30(11)a—b=a—(b+c)+c429-29