4x÷3=2.2.2×(x-12)=4.62解和验算 35.2x8-5x=61.1.26÷(3+x)=1.75x0.2求解和验算

问题描述:

4x÷3=2.2.2×(x-12)=4.62解和验算 35.2x8-5x=61.1.26÷(3+x)=1.75x0.2求解和验算

(1)4x÷3=2.4 4x=2.4*3 4x=7.2 x=1.8
(2) 2.2×(x-12)=4.62 2.2x-2.2*12=4.62 2.2x=4.62+26.4 2.2x=31.02 x=14.1
验算
左边= 2.2*(14.1-12) =2.2*2.1=4.62 右边=4.62 左边=右边=4.62 x=14.1是方程的解
(3)35.2x8-5x=61.9 281.6-5x=61.9 5x=281.6-61.9 x=219.7/5 x=43.94
(4) 1.26÷(3+x)=1.75x0.2 (3+x)=1.26/(1.75x0.2) (3+x)=1.26/0.35 (3+x)=3.6 x=0.6
验算
左边= 1.26/(3+0.6) =0.35 右边=1.75*0.2=0.35 左边=右边 x=0.6是方程的解