分数加减法计算具体如下:
1、3/7 × 49/9 - 4/3
2、8/9 × 15/36 + 1/27
3、12× 5/6 – 2/9 ×3
4、8× 5/4 + 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
(1) 6/14+7/14= (2) 2/13+5/13= (3) 6/15+9/15= (4) 6/14+1/14=
(5) 4/13+2/13= (6) 2/15+2/15= ( 7) 1/6+2/6= (8) 3/14+8/14=
(9) 3/14+4/14= (10) 4/12+5/12= (11) 4/9+3/9= (12) 4/14+1/14=
(13) 6/8+1/8= (14) 8/11+3/11= (15) 1/14+7/14= (16) 1/11+6/11=
(17) 10/13+1/13= (18) 6/11+2/11= (19) 4/12+2/12= (20) 7/15+6/15=
(21) 4/14+3/14= (22) 1/14+11/14= (23) 2/13+11/13= (24) 5/15+1/15=
(25) 2/15+5/15= (26) 7/10+1/10= (27) 3/14+6/14= (28) 3/9+1/9=
(29) 8/10+1/10= (30) 1/10+1/10= (31) 3/12+6/12= (32) 9/12+1/12=
(33) 9/14+1/14= (34) 5/9+2/9= (35) 1/10+7/10= (36) 1/12+9/12=
(37) 5/13+7/13= (38) 8/12+3/12= (39) 1/7+1/7= (40) 5/11+6/11=
(41) 8/12-4/12= (42) 1/10+5/10= (43) 8/15+7/15= (44) 5/14+7/14=
(45) 3/11+6/11= (46) 7/13-4/13= (47) 10-6/15= (48) 11/15-8/15=
(49) 7/15-6/15= (50) 3/6+1/6=
口算:21+31= 21-41= 52-51= 74-71= 87-83= 101+ 52= 65-32= 31+51= 83-41= 32+31= 83+83= 21-51= 74+73= 1-87= 65+65= 1-125= 53+21= 109-103= 75-75= 83+85= 61+127= 41+43= 73+21= 109-21= 109-53= 32-61= 54-103= 197+1911= 125-121= 65+31= 51-61= 61+41= 71-81= 81+81= 83-31= 95+94= 95—31= 54-32= 21-125= 65- 32= 21+0.4= 21-0.5= 0.2+101= 1-127= 85+87=
望采纳O(∩_∩)O~~~~
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