18. Whis which of the following is not true?
Chiny a (7+8)+9 = 7+28+1)
b. (7x8 ×9=7 x(88)
C 7+ 8+ 9 = 7+8) + (789)
d 74 (829)=(7x8)+(7x92
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Answer:Looks like every single calculation a,b,c,d are not true.
Step-by-step explanation:
a. (7+8)+9 = 7+28+1 = this will be 24=36 - not true
b. (7x8 ×9=7 x(88) = this wil be 623 = 616 - not true
c. 7+ 8+ 9 = 7+8) + (789) = this will be 24 = 804 - so not true
d. 74 (829)=(7x8)+(7x92) = this will be 61346 = 700 - so not true
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