解下列方程. x÷2.5=8 8x-4x=
解下列方程.x÷2.5=88x-4x=0.648(x+3.2)=64.81.2x=62x-0.24=0.127x+2.5x=3.8....
解下列方程. x÷2.5=8 8x-4x=0.64 8(x+3.2)=64.8 1.2x=6 2x-0.24=0.12 7x+2.5x=3.8.
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(1)x÷2.5=8,
x÷2.5×2.5=8×2.5,
x=20;
(2)8x-4x=0.64,
4x=0.64,
4x÷4=0.64÷4,
x=0.16;
(3)8(x+3.2)=64.8,
8x+25.6=64.8,
8x+25.6-25.6=64.8-25.6,
8x=39.2,
8x÷8=39.2÷8,
x=4.9;
(4)1.2x=6,
1.2x÷1.2=6÷1.2,
x=5;
(5)2x-0.24=0.12,
2x-0.24+0.24=0.12+0.24,
2x=0.36,
2x÷2=0.36÷2,
x=0.18;
(6)7x+2.5x=3.8,
9.5x=3.8,
9.5x÷9.5=3.8÷9.5,
x=0.4.
x÷2.5×2.5=8×2.5,
x=20;
(2)8x-4x=0.64,
4x=0.64,
4x÷4=0.64÷4,
x=0.16;
(3)8(x+3.2)=64.8,
8x+25.6=64.8,
8x+25.6-25.6=64.8-25.6,
8x=39.2,
8x÷8=39.2÷8,
x=4.9;
(4)1.2x=6,
1.2x÷1.2=6÷1.2,
x=5;
(5)2x-0.24=0.12,
2x-0.24+0.24=0.12+0.24,
2x=0.36,
2x÷2=0.36÷2,
x=0.18;
(6)7x+2.5x=3.8,
9.5x=3.8,
9.5x÷9.5=3.8÷9.5,
x=0.4.
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