760-(120+80)+60=,500-(270+130)-1=,120:(60:6):2=,90:(45:9)*2=.

Question

760-(120+80)+60=,500-(270+130)-1=,120:(60:6):2=,90:(45:9)*2=.

Answer 1

       2         1       3
760 - (120 + 80) + 60 = 620
1) 120 + 80 = 200
2) 760 - 200 = 560
3) 560 + 60 = 620
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       2         1        3
500 - (270 + 130) - 1 = 99
1) 270 + 130 = 400
2) 500 - 400 = 100
3) 100 - 1 = 99
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       2      1    3
120 : (60 : 6) : 2 = 6
1) 60 : 6 = 10
2) 120 : 10 = 12
3) 12 : 2 = 6
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    2      1     3
90 : (45 : 9) * 2 = 36
1) 45 : 9 = 5
2) 90 : 5 = 18
3) 18 * 2 = 36