Question

①（11/15-4/5+7/20）÷1/60 ②0.75×46+3/4×55-3÷4

解方程：60％X-3=15 1/2（X+1.5）=6 1/2X+1/5X=2.8
麻烦你了

Answer 1

①（11/15-4/5+7/20）÷1/60
=（11/15-4/5+7/20）×60
=44-48+21
=17
②0.75×46+3/4×55-3÷4
=3/4×(46+55-1)
=3/4×100
=75
60％X-3=15
0.6x=18
6x=180
x=30
1/2（X+1.5）=6
x+1.5=12
x=12-1.5
x=10.5

1/2X+1/5X=2.8
5x+2x=28
7x=28
x=4

Answer 2

0.6x-3+3=15+3
0.6x=18
0.6x÷0.6=18÷0.6
x=30
1/2（X+1.5）×2=6×2
x+1.5=12
x+1.5-1.5=12-1.5
x=10.5
1/2X+1/5X=2.8
(1/2+1/5)x=2.8
(0.5+0.2)X=2.8
0.7x=2.8
0.7x÷0.7=2.8÷0.7
x=4

Answer 3

30
10.5
4

Answer 4

30 10.5 4