Question

simplify 640➗80✖️4➖4 of 20➕639➖72➗9

Answer 1

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→For simplifying an expression containing various types of fractions ,the order of various operations involved should be strictly maintained.A single technique for arranging the expression in the proper sequence,is by placing them in the order of the


first letter appearing in VBODMAS
where the letter stands for ,
V - vinculum (- ) bar
B - bracet and operation of brackets 
in the order ( ) , { } and then [ ]
O - of 
M - multiplication. ( x )
A - addition ( + )
S - subtraction ( - )
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∴According to the problem ,

640 ÷ 80 × 4 - 4 of 20 + 639 - 72 ÷ 9

= 8 × 4 - 4 × 20 + 639 - 8 

[ since i) 640/80= 8 , ii) 72/ 9 = 8 ]


∴ 32 - 80 + 639 - 8

∴ 671 - 80 - 8

∴671 - 88

∴ 583 answer :-)


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Answer 2

8*4-80+639-8
32-80+639-8
671-80-8
583
hope it help you