7+5χ=42
100-2X=50
13χ-7.5χ= 18.7
(χ+ 12)×6= 108
180÷X= 12
5\6*5=6 5\4*2=5/8 2\ 1*4=2 4 4\5*2=2/5 3\ 1*5=3/5
7\2*6=7/ 12 5\2*6=5/ 12 3\5*2=3/ 10 5\7*2=5/ 14 5\6* 1=5/6
7\9*2=7/ 18 5\4*2=5/8 2\45*0=0 5\6-5\4=5\2 2\ 1+2\ 1= 1
4\5-4\5=0 3\2-3\ 1=3\ 1 5+4\ 1=5 4\ 1 5\ 1+5\ 1=5\2 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 5 1/9* 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 6 1/60* 122= 120 7/2*28=8 8/ 19* 16=38 1/ 1*2=2
9/7* 18= 14 25/7* 100=28 9/5*8 1=45 8/9* 16= 18 2/7*2=2/ 14
5\4/2=5\2 5\6/2=5\3 3\2/ 1=3\2 5*5\ 1= 1 5\9/3=5\3
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 5 1/9* 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 5/ 1*25=5
10/ 1*90=9 5/3* 105=63 19/7*38= 14 5/ 1*25=5 8/ 19* 16=38
8/ 19* 16=38 6 1/60* 122= 120 7/2*28=8 6/ 1*48=8 2\ 1*2= 1
9/7* 18= 14 25/7* 100=28 9/5*8 1=45 8/9* 16= 18
4/9×3= 5÷ 1/3 = 1/2÷ 1/3 = 2/7×3/9 ÷2/7 = 2 1/25÷42= 4/5×3/4 = 8.7×0.2= 4×0.25= 1/7× 14= 2/3÷5/6= / kloc-0/.25×8= 3/5÷5/ 8= 6/7×3/2= 6×8.8= 4/ 1 1÷4= 4/9×3/8= 5/3÷5= 0÷8/3= 4/7 -2/3= 2/7×2 = 4 1/ 12×4= 4÷3/ 16= / kloc-0/2÷9/4 = 75/ 8 ÷5= 12× 16/9 = 2/3×3= 8÷9/4 = 5/3÷3/5 = 4/5×5/8 = 7/9×9/7 =
2.64+3.6= 2.4×50= 3500÷70= 2050-298= 2+7÷9= 0.3÷3%= 8 1.2- 1 1÷7-×3= 6696÷62-6.5× 10.6 =
1.89÷ 100= 0.82+0.08= 73× 1= 0.63× 10= 4÷ 10= 17÷ 1000=
0.56+0.4= 1.25× 100= 5.6+99=
100÷25= 1-0.93= 90-0.9=
794- 198= 68×25= 6756- 193-207=
72× 125= 97×360+3×360=
Find the ratio 23: 38 45: 49 57:10 20: 23 32: 29 35: 41simplified ratio 28: 3516: 3212: 22 36: 72/kloc-0.
Find the ratio of 23: 38 45: 49 57:10 20: 23 32: 29 35: 41.
35:47 13: 17 25:27 23:29 39:40 53: 100
12: 13 14:25
Oral calculation 1-25%-35%=
1÷2=()%
33× 1/2=
25÷ 1/2=
15%+25%=
(9/7+ 12/ 19)×0=
33%+57%=
16×3/ 16=
(8/7- 1/7)×2=
52÷82%×0=
13× 1× 1/2=
23×3/5×5/3=
35:47 13: 17 25:27 23:29 39:40 53: 100
12: 13 14:25
1, write directly. (8 points)
1÷ 13 = 1- 12 - 13 = 58 ×23 = 56 ×( 18+625 )
16 × 12= 29 ÷35 = (3 18 +79 )×0= 12 +7 12 =
/On the left side of the fractional line is the denominator * multiplication sign.
2/ 1*2= 1 3/ 1*3= 1 3/2*3=2 3/ 1*6=2
4/3*8=6 5/3*20= 12 7/3* 14=6 8/7*40=35
4/3* 16= 12 9/5*27= 15 2/ 1*30= 15 12/7*24= 14
30/ 1*30= 1 5 1/9* 102= 18 19/9*76=36 4/9*8= 18
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
8/ 19* 16=38 6 1/60* 122= 120 7/2*28=8 6/ 1*48=8
9/7* 18= 14 25/7* 100=28 9/5*8 1=45 8/9* 16= 18
Choose! ! !