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(x一1.8)4=2.8怎么解

(×+1.8)÷4=2.8 解:(×+1.8)÷4=2.8 ×+1.8=2.8×4 ×=11.2-1.8 ×=9.4 验算 把Ⅹ=9.4代入算式 (9.4+1.8)÷4 =11.2÷4 =2.8 左边等于右边

(x-1.8)÷4=2.8 x-1.8=4X2.8 x=11.2+1.8 x=13

X一1.8=2.5x4 X一1.8=10 X=10+1.8 X=11.8

x-1.8=4 ×-1.8+1.8=4+1.8 ×=5.8

1.8:1.2=(x+4):x,由比例的基本性质,得 1.8x=1.2(x+4), 两边都除以0.6,得3x=2x+8, x=8.

7.72-X=1.8X+0.72 7=2.8X X=2.5

(1)x÷8=0.06 x=0.48 (2)1.26-2x=0.74 2x=0.52 x=0.26 (3)1.8÷x=7.5 x=0.24 (4)1.3x+1.5x=0.14 2.8x=0.14 x=0.05 (5)x-0.25x=2.8+0.2 0.75x=6 x= 4 (6)7x-3x+0.04=0.4 4x=0.36 x=0.09

(x-1.8)/2=(x+2.4)/4用方程怎么解? (x-1.8)/2=(x+2.4)/4 两边同乘以4 2x-3.6=x+2.4 x=6

20-1.85 jgpjw255

(1)x:24=3:8, 8x=24×3, x= 24×3 8 ,x=9,(2)8.1:x=1.8:36, 1.8x=8.1×36, x= 8.1×36 1.8 , x=162,(3) 1 2 : 2 3 =6:x 1 2 x= 2 3 ×6, 1 2 x=4, x=4÷ 1 2 , x=8,(4) 4.8 1.6 = x 2 . 1.6x=4.8×2, x= 4.8×2 1.6 , x=6.

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