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1,计算下面各题用(脱式计算) 1/6+1/3+1/2 8/15+...

1/6+1/3+1/2 =1/6+2/6+3/6 =1 8/15+(7/30-1/5) =16/30+7/30-6/30 =17/30 6/7-(1/7+1/2) =6/7-1/7-1/2 =12/14-2/14-7/14 =2/14 9/10-(1/4-1/6) =9/10-1/4+1/6 =54/60-15/60+10/60 =49/60

=5/8+5/6-5/8+5/6 =5/6+5/6 =10/6

13/15 23/30 1/2 29/24 39/30 1/72

15×(2/3+3/5) = 15×2/3+15×3/5 =10+9 =19 〖5/6-(1/8+5/12)〗×3/7 =[5/6-13/24]×3/7 =7/24×3/7 =1/8

6*(12分之5+15分之4-2分之1) =6*5/12+6*4/15-6*1/2 =5/2+8/5-3 =25/10+16/10-30/10 =41/10-30/10 =11/10 (8分之1+4分之3)*(1-3分之1) =(1/8+6/8)*2/3 =7/8*2/3 =7/12 743-92*51/23 =743-4*51 =743-204 =539 3/[(4分之3+(5分之4-5分之1))] =3/(...

①(444我?我4)÷(我?4我),=(444我?94我)÷我我,=41×我我,=49;②44×我+4我×我+4我×4+44×9+49×1+47×8,=(4-4我)+(4我?4我)+(4我?44)+(44-49)+(49?41)+(47?48),=4?4我+4我?4我+4我?

(1)2-14-13-34=2-(14+34)-13=2-1-13=1-13=23;(2)0.8+58+0.2=0.8+0.2+58=1+58=59;(3)15-5÷12-712=15-512-712=15-(512+712)=15-1=14;(4)16+57+56=16+56+57=1+57=157;(5)19+38+58=19+(38+58)=19+1=119;(6)79+23-49=79-49+23...

12又3分之2+15又4分之3+9又12分之7 2. 4又2分之1-(4又4分之1-3又8分之3) =12+15+9+2/3+3/4+7/12 =36+8/12+9/12+7/12 =36+2 =38; 2. 4又2分之1-(4又4分之1-3又8分之3) =(4+1/2)-4-1/4+3+3/8 =1/4+3+3/8 =3+5/8; =3又8分之5; 3。1又4分之1+2...

39+[-23]+0+[-16]= 0 [-18]+29+[-52]+60= 19 [-3]+[-2]+[-1]+0+1+2= -3 [-301]+125+301+[-75]= 50 [-1]+[-1/2]+3/4+[-1/4]= -1 [-7/2]+5/6+[-0.5]+4/5+19/6= 1.25 [-26.54]+[-6.14]+18.54+6.14= -8 1.125+[-17/5]+[-1/8]+[-0.6]= -3 [-|98|+76+(...

29. 45 × 2/3 + 1/3 × 15 30. 7/19 + 12/19 × 5/6 31. 1/4 + 3/4 ÷ 2/3 32. 8/7 × 21/16 + 1/2 33. 101 × 1/5 – 1/5 × 21 34.50+160÷40 35.120-144÷18+35 36.347+45×2-4160÷52 37(58+37)÷(64-9×5) 38.95÷(64-45) 39.178-145÷5×6+42 40.81...

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