(3.2+6.5X = 16.2 3(7X-0.4)= X+0. 1.35-X = 4(X+5)

0.7X+6.8 = 15.2(2) 12-2X = 1.5X+5 0.4X+5.2 = 7.8

2. Calculate by recursive equation (if it can be calculated simply, calculate by simple method) 24%

( 1)39.45+ 19.35+0.55-9.35 (2)390-360÷ 15×6+60

(3)0.48×25×0.3 (4)93.2× 15- 12.2× 15- 15

(5)(8.8-7.7÷2.5)×( 1-0.45) (6)8÷[(22÷5.5+4.5)÷0. 17]

(7) 4.02-3.5+0.98 (8)3. 14×625+3. 14× 174+3. 14

Third, synthesis or equation solution.

1, 3 times of a number and 2.25 less than 6.75, find this number.

What is the quotient of the sum of 2, 5.35 and 3.05 divided by the difference between 2 1.48 and 10.98?

The product of 3,8 and 125, minus the quotient of 24 divided by 1.2, what's the difference?

4.8 times 24 equals 20 times this number. Find this number.

5. What is the product of10 minus 3.5 multiplied by the sum of 3.5 and 1.5?

6. 4 times a number times 3.2, which is 7 times smaller than 4.5 times this number. What's this number?

7. 4.5 times a number equals the difference between 39.4 and 25.9. What's this number?