解方程 (x+1.7)×2=9

解方程 (x+1.7)×2=9.2 8x-4x=0.64 2x-0.24=0.12 7x+2.5X=3.8.
2025-02-23 23:15:09
推荐回答(1个)
回答1:

①(x+1.7)×2=9.2,
(x+1.7)×2÷2=9.2÷2,
x+1.7=4.6,
x+1.7-1.7=4.6-1.7,
x=2.9;

②8x-4x=0.64,
x(8-4)=0.64,
4x=0.64,
4x÷4=0.64÷4,
x=0.16;

③2x-0.24=0.12,
2x-0.24+0.24=0.12+0.24,
2x=0.36,
2x÷2=0.36÷2,
x=0.18;

④7x+2.5X=3.8.
x(7+2.5)=3.8,
9.5x=3.8,
9.5x÷9.5=3.8÷9.5,
x=0.4.