A 25+(x–25).5=5. 4 mũ 2
B 3.(x+3)+19=7 mũ 2
C x mũ 2=81
d x=[(1800+600):30]=560:(315-35)
A 25+(x–25).5=5. 4 mũ 2 B 3.(x+3)+19=7 mũ 2 C x mũ 2=81 d x=[(1800+600):30]=560:(315-35)
By Gabriella
By Gabriella
A 25+(x–25).5=5. 4 mũ 2
B 3.(x+3)+19=7 mũ 2
C x mũ 2=81
d x=[(1800+600):30]=560:(315-35)
Đáp án:
Giải thích các bước giải:
A,25+(x-25).5=5. 4²
⇔25+(x-25).5=5.4.4
25+(x-25).5=20.4
25+(x-25).5=80
(x-25).5=80-25
(x-25).5=55
x-25=55:5
x-25=11
x=11+25
x=36
B,3.(x+3)+19=7²
⇔3.(x+3)+19=7.7
3.(x+3)+19=49
3.(x+3)=49-19
3.(x+3)=30
x+3=30:3
x+3=10
x=10-3
x=7
C,x²=81
⇔x.x=81
x=9
D,x:[(1800+600):30]=560:(315-35)
x:[2400:30]=560:280
x:80=2
x=80.2
x=160