精品文档---下载后可任意编辑一、口算
(10 分)10-=0÷3
8=09×0
08= 24÷0
4=60 67
25= 6+14
4==5-3=2 80×0
125=80*18 =1037 ÷3×17 =37 *13 ×17 =149二、用简便方法计算下面各题
(90 分,4×20+5×2)1125-997 998+1246 413 +3
2+523 1225 -(127 +225 ) 400÷125÷8 25×(37×8)=1125-(1000-3) =(998+2)+(1246-2) =(413 +523 )+()=1225 -225 -127=400÷(125*8)=25*8*37=1125-1000+3=1000+1244 =10+10=20 =10-127 =857 =400÷1000=25 =200*37=7400 =125+3=128 =2244(14 -16 )×12 134 ×2415 ×47 34×(2+1334 ) 125××=(624 -424 )*12 =74 ×2415 ×47 =34×2+34×1334 =125*(8+0
8) =(4
65)+(4
4*(99+1)=224 *12 =(74 ×47 )*2415 =68+13 =125*8+125*0
8 =8+8=16 =3
4*100=340=1 =1*2415 =2415 =81 =1000+100=110017
53 1756 -334 -45679 ÷215 +511 ×29 ××=17
53) =1756 -456 -334 =79 ÷115 +511 ×29 =18 *14 *32 =22
55)=17
15-10 =13-334 =914 =79 *511 +51