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)