13.1)х:12=4.3/4:7.1/8 х:12=19/4:57/8 х=19/4*12:57/8 х=57:57/8 х=57*8/57 х=8 2)6.1/2:х=6.5/6:4,1 х=6.1/2*4,1:6.5/6 х=13/2*4,1:41,6 х=53,3/2:41/6 х=53,3/2*6/41 х=159,9/41 х=3,9 3)3.1/3х:1,5=4.2/7:3/14 10/3х:1,5=30/7:3/14 10/3х=1,5*30,7:3/14 10/3х=15,35:3/14 10/3х=15,35*14/3 10/3х=214,9/3 10/3х=71,63 х= 71,63:10/3 х=71,63*3/10 х=21,489 4)3.7/19:1.1/2=2.3/8:0,8х 64/19:3/2=2:0,8х 0,8х=2*3/2:64/19 0,8х=3:64/19 0,8х=3*19/64 0,8х=19/21,3 х=19/21,3:0,8 х=19/21,3*1/0,8 х=23,75/21,3 14.1)22-2,98*0,2:0,4-2,1+3,6=24,99 1.-2,98*0,2=-0,596 3.-0,596:0,4=-1,49 4.22+1,49=23,49 5.23,49-2,1=21,39 6.21,39+3,6=24,99 2)21,585-0,585-18,009:3:0,9+0,869*10=36,36 1.-18.009:3=-6,003 2.-6,003:0,9=-6,67 3.21,585-0,585=21 4.21+6,67=27,67 5.0,869*10=8,69 6.27,67+8,69=36,36 3)0,79*71-31,45:0,85+3,8*10,14:7,8=24.03 1.0,79*71=56,09 2.31,45:0,85=37 3.56,09-37=19,09 4.3,8*10.14=38,532 5.38,532:7,8=4,94 6.19.09+4,94=24.03 4)3,13(36,599+4,026-8,545-0,08):4=25,04 1.36,599+4,026=40,625 2.40.625-8,545=32.08 3.32.08-0,08=32 5.3,13*32=100.16 6.100.16:4=25.04 5)23-0,05*10.1+0,395:(49,001-49)*0,009=27.06 1.-0,05*10.1=-0,505 2.49,001-49=0,001 3.0,395:0,001=395 4.395*0,009=3,555 5.23+0,505=23,505 6.23,505+3,555=27.06 6)176(1,866+3.134-3,77):(15,481+1,2-8,681)=27,06 1.1,866+3.134=5 2.5-3,77=1.23 3.176*1,23=216,48 4.15,481+1,2=16.681 5.16.681-8,681=8 6.216,48:8=27,06 7)21-0,2(92,28-91)+73.26:(10,45-0,45)=28.07 1.92,28-91=1,28 2.0,2*1,28=0,256 3.21-0,256=20.744 4.10.45-0.45=10 5.73.26:10=7.326 20,744+7,326=28,07 8)35,628+2,372-316,66:0.5:(99,479-284,79*0,1)=33.06 1.-316,66:0,5=-633,32 2.-284,79*0,1=-28,479 3.99,479+28,479=127,958 4.-633.32:127,958=4,94 5.35,628+2,372=38 6.38-4,94=33.06 15)1)(15/16-2,25)*0,16-0,42:0,4=1.246875 1.15:16-2,25=-1,3125 2.-1,3125*0,15=-0,196875 3.-0,42:0,4=-1.05 4.-0.196875+1,05=1.246875 2)-0,168:1,6+0,2(0,45-4/5)=0.035 1.-0.168:1,6=-0,105 2.0,45-4/5=-0,35 3.0,2*(-0,35)=-0,07 4.-0.105-0.07=0.035 3)-0,54(-1/9):(4,59:4,5-1,5)-2=-1,875 1.-0,54*(-1/9)=-0,06 2.4,59:4,5=1.02 3.1.02-1,5=-0,48 4.-0,06:(-0,48)=0.125 5.0,125-2=-1,875 4)-3+(2,94:2,8-1,5)(-1/9):(-0,036)=-4.38 1.2,94:2,8=1.05 2.1,05-1.5=-0,45 3.-0,45*(-1/9)=0,05 4.0,05:(-0,036)=-1.38 5.-3-1.38=-4,38 5)(0,02*0,01-0,01):0,25-3/8=-0,3358 1.0,02*0,01=0,0002 2.0,0002-0,01=-0,0098 3.-0,0098:0,25=-0,0392 4.-0,0392-3/8=-0.3358 6)-3/4+8,5(0,021:0,01-2,51)=2,735 1.0.021:0.01=2.1 2.2.1-2.51=-0,41 3.8,5*(-0,41)=-3.485 4.-3/4+3,485=2,735 7)(0,15-0,15*6,4):(-3/8+0,175)=-5.55 1.-0,15*6,4=-0,96 2.0,15+0,96=1.11 3.-3/8+0.175=-0,2 4.1.11:(-0,2)=-5.55 8)(1,6*2,15-0,23):(3,45-3.3/4)=16,05 1.1,6*2.15=3.44 2.3,44-0,23=3.21 3.3.45-3.3/4=3.45-15:4=0,2 4.3.21:0,2=16.05