需要大师解答急急急求你了
展开全部
2019年8月5日作业:
(星期一,农历己亥猪年七月初五)
1.30 40
2. 75/2
3.50 2 2 80
4. 225 300
5.51
6.原价:18÷9/10
=18×10/9
=180÷9
=2×10
=20(元)
便宜:20-18=2(元)
7.1-1/4=3/4
18÷(1/2-1/4)
=18÷(2/4-1/4)
=18÷1/4
=18÷0.25
=18×4
=72(千克)
8.现价:380×6/10
=380×0.6
=2880÷10
=38×6
=228(元)
便宜:380-228=152(元)
9.①28÷(6/5÷3/7)
=28÷(6/5×7/3)
=28÷14/5
=28×5/14
=28÷14×5
=2×5
=140÷14
=10
② 13/12÷(3/4+1/3)
= 13/12÷(9/12+4/12)
=13/12÷13/12
=13/12×12/13
=1×1
=(13×12)/(12×13)
=156÷156
=1
③44×7/8÷11/8
=77/2÷11/8
=77/2×8/11
=(77×8)/(2×11)
=616÷22
=28
④ 25+3/10x=55
3/10x=55-25
3/10x=30
x=30×10/3
x=300÷3
x=30÷3×10
x=10×10
x=100
⑤5x-9/10=60
(50x-9)/10=60
50x-9=600
50x=600+9
50x=609
x=609÷50
x=609/50
⑥ x÷3/4=4/5
4/3x=4/5
x=4/5÷4/3
x=4/5×3/4
20x=12
x=12÷20
x=3/5
10.×
(星期一,农历己亥猪年七月初五)
1.30 40
2. 75/2
3.50 2 2 80
4. 225 300
5.51
6.原价:18÷9/10
=18×10/9
=180÷9
=2×10
=20(元)
便宜:20-18=2(元)
7.1-1/4=3/4
18÷(1/2-1/4)
=18÷(2/4-1/4)
=18÷1/4
=18÷0.25
=18×4
=72(千克)
8.现价:380×6/10
=380×0.6
=2880÷10
=38×6
=228(元)
便宜:380-228=152(元)
9.①28÷(6/5÷3/7)
=28÷(6/5×7/3)
=28÷14/5
=28×5/14
=28÷14×5
=2×5
=140÷14
=10
② 13/12÷(3/4+1/3)
= 13/12÷(9/12+4/12)
=13/12÷13/12
=13/12×12/13
=1×1
=(13×12)/(12×13)
=156÷156
=1
③44×7/8÷11/8
=77/2÷11/8
=77/2×8/11
=(77×8)/(2×11)
=616÷22
=28
④ 25+3/10x=55
3/10x=55-25
3/10x=30
x=30×10/3
x=300÷3
x=30÷3×10
x=10×10
x=100
⑤5x-9/10=60
(50x-9)/10=60
50x-9=600
50x=600+9
50x=609
x=609÷50
x=609/50
⑥ x÷3/4=4/5
4/3x=4/5
x=4/5÷4/3
x=4/5×3/4
20x=12
x=12÷20
x=3/5
10.×
追答
望采纳
采纳最佳答案
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询