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1、1.25X (8+10)= 1.25X8+1.25X 10= 10+12.5=22.59123- (123+8.8) =9123-123-8.8 =9000-8.8=8991.2=8.3 X (1.24+1.76)=8.3X3=24.99999X1001二9999X (1000+1) =9999X1000+9999X1 =1000899914.8X6.3-6.3X6.5 + 8.3X3.7 =(14.8-6.5) X6.3 + 8.3X3.7 =8.3X6.3+83X3.78.3X C6.3 + 3.7)=8.3X10二831.24+0.78+8.76二(1.24+8.76) +0.78= 1
2、0+0.78= 10.78933-157-43=933- (157+43)=933-200二7334821-998=4821-1000+2=3823132 X 125X25 =4X8X125X25二(4X25) X (8X 125)= 100X1000二-5(-32)-(+5)=(-32)+(-5)=-377.3-(-6.8)=7.3 + (+6.8)= 14.1(-1/50-(-2/3)-(+0.48)-(+4/9)=(-1/50)+(+2/3) + (-0.48)+(-4/9)二-1/50+2/3-0.48-4/9= -1/50-0.48+2/3-4/9=(-0.02-0.48) + (6
3、/9-4/9)=-5/18(-2)(25)二(-2)+(+25)二23=-(1/2*1/4)= -1/8(-1/2) * (-3/4)二 + (1/2*3/4)= 3/8(-3)*5/6*(-3/5)*(-9/4)=-3*5/6*3*5*9/4=-27/8(-0.25)*0.5*(-100)*4二(-4*0.25)*0.5*(-100)=-1*(-50)二50(-5)*10/34-2*10/34-(-6)*10/3二(-5 + 2-6)*10/3=-9*(3+ 1/3)= -27-3二-30=-13*2/3 + 1/3*(-13)+(-0.34*2/7-5/7*0.34) =-13*(2/3
4、+ 1/3)+0.34*(-2/7-5)=-13-0.34= -13.34(-3)4- (-7/4) *0.75*7/34-3=-3* (-4/7) *3/4*7/3*1/3=3*4*3/4*7/3/1/3=1-3-【-5+ (1-02*3/5) + (-2)=-3-5 + (1-3/25)+ (-2)二-3-卜5+22/25*(-1/2)= 3(-5-11/25)=-3+5X11/25=2X11/2515+ (1/5-1/3)= 154- (-2/15)=-15*15/2=-225/2(-5/6) + (-2/3) * (-3/2)二(-5/6) * (-3/2) * (-3/2)=-5/6
5、*3/2*3/2=-15/8=10000090484-268二(2600+2600+2600+1248) +26=2600 + 26+2600 + 26+2600 4- 26+1248 + 269=100+100+100+48二34828814- 43=(1290+1591)+ 434= 12904-43+15914-43=30+373.2 X 42.3 X 3.75-12.5 X 0.423 X 16 =3.2 X 42.3 X 3.75-1.25 X 42.3 X 1.6 =42.3X(3.2X3.75-1.25X 1.6)=42.3 X(4X 0.8 X 3.75-1.25 X4X 0.
6、4)=42.3 X(4X0.4X2X 3.75-1.25X4X 0.4)=42.3 X (4x0.4x7.5-1.25x4x0.4)=42.3X4X0.4X(7.5-1.25)=42.3 X 4X0.4X6.25=423X(4X2.5)二4237= 1.8+12-0.15=13.656.5X8+3.5X8-47=52+28-47=80-47(80-9.8) X 5 分之 2-1.32=70.2X2/5-1.32=26.768 义 7 分之 4 + 1+(3.22.95)=8X4/7 +1+0.25=8X4/7+4=8/72700 X (506-499) 4-900=2700X74-900= 1
7、89004-900=21=10(1 + 1 1) +5.1=(1 1) 4-5.1=04-5.1二018.1+ (3-0.2994-0.23) XI= 18.1 + 1.7X1= 18.1 + 1.7=19.8-18+29+-52+60=19-3+-2+-1+0+1+2=-3-301+125+301+-75二50-1+-1/2+3/4+-1/4二-1-7 +5/6+-0.5+4/5+19/6=1.25-26.54+-6.14+18.54+6.14=-81.125+-17/5+-1/8+-0.6=-30.3x3.6 = 1.080.3x0.3 = 0.0910X0.07= 0.70.92X0.4
8、= 0.3680.2X0.26=0.0520.14X4=0.560.02X0.1 = 0.0021.2X03= 0.362.5XO.4=13.25X0 = 00.9-0.52= 0.383.99X1 = 3.990X3.52=012.5X8 = 1008 10 = 0.810-1.8-7.2= 10.43 + 3.57= 42.5X4X12 = 1447.5x-3x =4.5xa+3a+7a= Ila1.05X100= 105”0.5二 20.96 + 3 = 0.320.56X100= 563.78X100= 3784 + 0.8 =53.215X100= 321.50.8X10=81.1
9、x 0.2 =0.220.6 X 0.8 = 0.483X0.9= 2.72.5 X 0.4=10.16X 5 = 0.81.78+2.2 = 3.981.2X0.5-0.4 = 0.20.7 + 0.01 = 702.5 X 0.4 二 112-3.9=8.15.37X0+4.63 =4.633.9+2.03= 5.937.2 + 2.8 = 101.4X5= 73/5 + (-2/3)=9/15 + (-10/15)= -(10/15 -9/15)=-1/151/2 + (-2/3)+4/5 + (-1/2) + (-1/3)=1/2 + (-1/2) + (-2/3) + (-1/3) +4/5= -1/513/17-3.5-6+2.5 + 6+4/17=(13/17+4/17 + (-3.5)+2.5 + -6 + 6=1 + (-1)+0=0(-3.8)+2.7+(-0.43) + 1.3 + (-0.2)=(-3.8)+(-0.2) + 2.7+1.3+(-0.43)二(一4)+4+(-0.43)= -0.435/6+(-3/4)= 10/12 + (-9/12)=10/12-9/12= 1/12(-57/8) + 2.125 + (-3.37) + (-2.63) + 25/4+(-0.25)=(-7.125)+2.125-6+6.25-0.25