Toán Lớp 4: a) 1200 : 24 – ( 17 – x) = 36
b) 9 × ( x + 5 ) = 729
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Toán Lớp 4: a) 1200 : 24 – ( 17 – x) = 36
b) 9 × ( x + 5 ) = 729
Comments ( 2 )
A) 1200: 24- (17-x ) = 36
50- (17-x) = 36
50- x = 36+ 17
x = 53- 50
x= 3
B) 9 x ( x + 5 ) = 729
( x +5 ) = 729 : 9
( x +5 ) = 81
x = 81-5
x. = 76