Toán Lớp 6: Tính giúp tớ 2 câu này:
– 145 + 43 + (- 145) + 57
– 2x + 2 mũ 3 = 4 mũ 2
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Toán Lớp 6: Tính giúp tớ 2 câu này:
– 145 + 43 + (- 145) + 57
– 2x + 2 mũ 3 = 4 mũ 2
Comments ( 2 )
Tham khảo:
145 + 43 + ( -145 ) + 57
= [ 145 + ( -145 ) ] + ( 43 + 57 )
= 0 + 100
= 100
2x + 2^3 = 4^2
2x + 8 = 16
2x = 16 – 8
2x = 8
x = 8 : 2
x = 4
#Sad
a. -145 + 43 + (-145) + 57
= (43 + 57) + (-145+-145)
= 100 + (-290) = -190
b. -2x + $2^{3}$ = $4^{2}$
-2x + 8 = 16
-2x = 16 – 8
-2x = 8
x = 8:-2
x = -4