解方程 3×0.7+4x=

解方程 3×0.7+4x=6.5 3.6x-x=3.25 2(x-0.5)=1.6 3x=4.914.
2024-11-26 03:47:33
推荐回答(1个)
回答1:

(1)3×0.7+4x=6.5,
2.1+4x=6.5,
2.1+4x-2.1=6.5-2.1,
4x=4.4,
4x÷4=4.4÷4,
x=1.1;

(2)3.6x-x=3.25,
2.6x=3.25,
2.6x÷2.6=3.25÷2.6,
x=1.25;

(3)2(x-0.5)=1.6,
2x-1=1.6,
2x-1+1=1.6+1,
2x=2.6,
x=1.3;
(4)3x=4.914,
3x÷3=4.914÷3,
x=1.638.