Question

421×2-81:9= (60-4×8)×(50-6×7)=
52×4+17= 8×9-18:3+6×9-4×7=
5×100+84= 40:5-63:7+6×8=
24+2×512= 100-30:5×8-6×4:3=
89+64:8×7-28:7×4=
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Answer 1

421×2-81:9= (60-4×8)×(50-6×7)
842-9= (60-32)×(50-42)
833=28×8
833=224 (fals)


52×4+17= 8×9-18:3+6×9-4×7
408+17= 72-6+54-28
425= 66+54-28
425= 120-28
425=92 (fals)


5×100+84= 40:5-63:7+6×8
500+84= 8-9+48
584= -1+48
584=47 (fals)


24+2×512= 100-30:5×8-6×4:3
24+1 024= 100-6×8-24:3
1 048= 100-48-8
1 048=52-8
1 048=44 (fals)


89+64:8×7-28:7×4=
89+8×7-4×4=
89+56-16=
145-16=
129

Answer 2

421 × 2 - 81 : 9 = 842 - 9 = 833

___________________________

( 60 - 4 × 8 ) × ( 50 - 6 × 7 ) =224

= ( 60 - 32 ) × ( 50 - 42 ) =

= 28 × 8 =

= 224  

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52 × 4 + 17 = 208 + 17 = 225

_______________________

8 × 9 - 18 : 3 + 6 × 9 - 4 × 7 =

= 72 - 6 + 54 - 28  =

= 66 + 54 - 28 =

= 120 - 28 =

= 92

_____________________

5 × 100 + 84 = 500 + 84 = 584

________________________

40 : 5 - 63 : 7 + 6 × 8 = 8 - 9 + 48 = - 1 + 48 = 47

AICI era: 40 : 5 - 63 : 9 + 6 × 8 = 8 - 7 + 48 = 1 + 48 = 49

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24 + 2 × 512 = 24 + 1 024 = 1 048

__________________________________

100 - 30 : 5 × 8 - 6 × 4 : 3 = 100 - 48 - 8 = 52 - 8 = 44

_________________________________________  

89 + 64 : 8 × 7 - 28 : 7 × 4 = 129

= 89 + 8 × 7 - 4 × 4 =

= 89 + 56 - 16 =

= 145 - 16 =

= 129