人教版小学数学五年级下册口算竞赛试题

/9 = 3 - 2/3 = 3/4 - 1/2= Р1/6 + 1/2 -1/6 = 7.5-(2.5+3.8)= 7/8 + 3/8 = 3/10 +1/5 =Р4/5 - 7/10 = 2 - 1/6 -1/3 = 0.51÷17= 32.8+19= 5.2÷1.3= 1.6×0.4= 4.9×0.7= 1÷5= Р 6÷12= 0.87-0.49= 3.8+2-8+2 = 4.25X4=Р123+25= 123-35= 56×7= 135÷5= 248+89= 146-23= 155×5= 456-12= 456+45= 546-457= 45×10=451 564-12=47. 879+54= .896-546=350 ...Р56×12= 45-5= 457+456= Р0.3X2.5X0.4 = 50X0.13X0.2= 0.8X630X0.125= 0.78X101= Р1.5X102 = 9.8X25 = 1.2X2.5+0.8X2.5 = 1.25X0.7X0.8 =Р3.8+4.5+6.2 = 93÷0.31÷3 = 3.25-0.84-0.16 = 88X0.25X4 =Р2.8X3.6+1.4X2.8Р= (3.2+0.128)÷0.8 = 9.83X1.5+6.17X1.5 =Р10.1X87 = 312X4+188X4 = 0.135X500X0.2 =Р6.3+0.84+3.7+8.16 = 18.75-0.43-4.57 = 0.25X0.03X4 =Р13.7X0.25X8= 2.65X1.7+1.35X1.7 = 32.8+5.6+7.2 =Р(2.5+0.25)X0.4 = 8X(2.5X0.25)= 8.4X0.2+1.6X0.2 =Р1.25X0.8X0.5 = (1.5+0.25)X0.4 = 1.2X0.4+1.3X0.4 =