5 3.5

2、0.25× +2.5% 9.6-11÷7+ ×4

=0.2+2.5% =9.6- + =12×[ ×3]

=0.2+0.025 =9.6-( - ) =12×

=0.225 =9.6-1 =42

=8.6

3、5.4+2X = 8.6 2.5:5 = x:8 0.2 = 1- X24

解：2X =8.6-5.4 解：5x=2.5×8 解： X24 =1-0.2

2X =3.2 X=20÷5 X24 =0.8

X =1.6 X=4 X = 0.8×24

X =19.2

(1)

4、(1)、(180-10)÷50﹪ (2)、(0.15÷ +5)×

=170÷0.5 =( +5)×

=340 = ×

= 或1.35

五 1、80×5÷100

=400÷100

=4(小时)

答:略。

2、96-96×60﹪ 96×60﹪×6

=96-57.6 =57.6×6

=38.4(元) =345.6(元) 345.6<360

答:略。

3、38÷1﹪=3800(元) 答:略。

4、解：设实际平均每天组装汽车X辆。

(25-5)X = 4000

20 X =4000

X =200

答:略。

5、(5×3.5+3×3.5)×2 + 5×3

=(17.5 + 10.5) ×2 + 15

=56 + 15

=71(平方分米)

答:略。

6、20 ÷ 2 = 10(米)

20×25 - × 3.14 × 102

=500 – 1.57 × 100

=500 – 157

=343(平方米)