2./代表除法。

3和21代表二分之一，5+41=5 41表示5 4/1（带分数）56 * 5 = 6 54 * 2 = 5/8 21 * 4 = 2 445 * 2 = 2/5 31 * 5 = 3/5 72 * 6 = 7/12 52 * 6 = 5/12 35 *0=0 56-54=52 21+21=1 45-45=0 32-31=31 5+41=5 41 51+51=52 7/7+7/7=2 2/1*2=1 3/1*3=1 3/2*3=2 3/1*6=2 4/3*8=6 4/3*8=6 5/3*20=12 7/3*14=6 8/7*40=35 4/3* 16=12 4/3*16=12 9/5*27=15 2/1*30=15 12/7*24=14 30/1*30=1 30/1*30=1 51/9*102=18 19/9*76=36 4/9*8=18 5/8*90=144 5/8*90=144 99/98*99=98 3/14*6=28 7/1* 28=4 10/1*90=9 5/3*105=63 19/7*38=14 5/1*25=5 6/1*48=8 7/2*28=8 8/19*16=38 8/19*16=38 61/60*122=120 7/2*28=8 8/19*16=38 1/1*2=2 9/7*18=14 25/7* 100=28 9/5*81=45 8/9*16=18 2/7*2=2/14 54/2=52 56/2=53 32/1=32 5*51=1 59/3=53 7/1*8=56 3/1*3=1 3/2*3=2 3/1*6=2 4/3*8=6 4/3*8=6 5/3*20=12 7/3*14=6 8/7* 40 = 35 4/3 * 16 = 12 4/3 * 16 = 12 9/5 * 27 = 15 2/1 * 30 = 15 12/7 * 24 = 14 30/1 * 30 = 1 30/1 * 30 = 1 51/9 * 102 = 18 19/9 * 76 = 36 4/9 * 8 = 18 5/8 * 90 = 144 5/8 * 90 = 144 99/98 * 99 2 = 5/14 2/3+1/6 = 5/6 1/3+1/4 = 7/121/3-1/4 = 1/12 1/5+1/7 = 12/35 1/5-1/7 = 2/35 1/4+1/9 = 13/36 1/4-1/9 = 5/361/8+1/9 = 17/72 1/8-1/9 = 1/72 1/10+7/9 = 704 + 1/4 5.6÷ 3/8 – 3/8 ÷6 6.4/7 × 5/9 + 3/7 × 5/9 7.5/2 -( 3/2 + 4/5 ) 8.7/8 + ( 1/8 + 1/9 ) 9.9 × 5/6 + 5/6 10.3/4 × 8/9 - 1/3 11.7 × 5/ 49 + 3/14 12.6 ×( 1/2 + 2/3 ) 13.8 × 4/5 + 8 × 11/5 14.31 × 5/6 – 5/6 15.9/7 - ( 2/7 – 10/21 ) 16.5/9 × 18 – 14 × 2/7 17.4/5 × 25/16 + 2/3 × 3/ 4 18.14 × 8/7 – 5/6 × 12/15 19.17/32 – 3/4 × 9/24 20.3 × 2/9 + 1/3 21.5/7 × 3/25 + 3/7 22.3/14 ×× 2/3 + 1/6 23.1/5 × 2/3 + 5/6 24.9/22 + 1/ 11 ÷ 1/2 25.5/3 × 11/5 + 4/3 26.45 × 2/3 + 1/3 × 15 27.7/19 + 12/19 × 5/6 28.1/4 + 3/4 ÷ 2/3 29.8/7 × 21/16 + 1/2 30.101 × 1/5 – 1/ 5 × 21 1.口算下列问题（1）58+42 =（2）87-45 =（3）125×8 =（4）50×12 =（5）804÷4 =（6）134+66 =（7）10000。然后计算数量。(1) 168+36-36+32 = (2) 153-5× 14+83 = (3) 50× 5 ÷ 50× 5 = 4.用简单方法计算:（1）3786-499（2）32。452+99× 452 (7) 201× 79 (8) 50× 125× 4× 85.计算下列问题:（1）340×（120-40÷8）（2）45×（720-1957÷。

亲爱的朋友们大家好，小汤圆来为亲爱的朋友们解答以上问题。/k 12 o 3c 91 co 0/00是一个很难回答的问题，/k 12 o 3c 91 co 0/00对许多人来说是未知的。现在让我们来看看！