(Answer time: 90 minutes, clean and tidy test paper, 2 points)

Name, class score

First, write the number directly. (5 points)

3×4/9=3/4 1/5+2/3= 13/ 15 1/2- 1/3=6/ 1 5/8÷3/8=5/3 1÷4/7=7/4

3/4×6=9/2 15/4×2/5=3/2 1÷ 10%= 10 8/9÷4=2/9 2/3× 12×3/4=6

Secondly, the calculation of recursive equation can be simple and convenient. (12)

9×(2/3-2/5)÷3/5 3/ 17÷3/4+3/ 17×4/3

=9×( 10/ 15-6/ 10)×5/3 =3/ 17×4/3+3/ 17×3/4

=9×4/ 15×3/5 =4/ 17+4/ 17

=36/25 =8/ 17

( 1/2+2/3)÷3/4-2/3 8/9×[3/4-(7/ 16- 1/4)]

=(3/6+4/6)×4/3-2/3 =8/9×[3/4-3/ 16]

=7/6×4/3-2/3 =8/9×9/ 16

=7/9-2/3 = 1/2

= 1/9

Third, the solution ratio. (9 points)

6:8 = x:24 3/x = 12/ 15 3/4:3/5 = 7/x

Solution: 8x=6*24 Solution: 12x=3* 15 Solution: 4/5 = 7/x.

x = 144 \ 18 x = 45 \ 12 4x = 5 * 7

x=8 x=3.8 x =35\4

x =87.5