(1)3x-15=45
解:3x÷3-15=45÷3
x-15=15
x-15+15=15+15
x=30( )改正:
(2) 6(x-2.4)=12
解:6x-2.4=12
6x-2.4+2.4=12+2.4
6x=14.4
x=2.4( )改正:
(3)2.5x+3.3=24.6
解:2.5x+3.3÷3=24.6÷3
2.5x+1.1=8.2
2.5x+1.1-1.1=8.2-1.1
2.5x=7.1
x=2.84( )改正:
同类型试题
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2