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2.3x+1.7x=8.44 0.9x-0.4x=20 7.5x-7x=12.5 ...

2.3x+1.7x=8.44 4x=8.44 x=2.11 0.9x-0.4x=20 0.5x=20 x=40 7.5x-7x=12.5 0.5x=12.5 x=25 7x-2x=155 5x=155 x=31 3.5x+2x=16.5 5.5x=16.5 x=3

(x+0.4)X1.2=8.4 x+0.4=8.4÷1.2 x=7-0.4 x=6.6

此题判断为 对

0.4x-12.6=8.4 0.4x=12.6+8.4 0.4x=21 x=210/4 x=52.5 八分之一:四分之一=十分之一:x 4/8=1/10x 1/2=1/10x 10x=2 x=0.2 三分之一x+四分之一x=21 7/12x=21 x=21×12/7 x=36 0.25分之x:九分之四(题目不全)

2.3x+1.7x=8.44 4X=8.44 x=2.11

解;(1)0.16x+0.4x=8.4, 0.56x=8.4, 0.56x÷0.56=8.4÷0.56, x=15;(2)12.5+8+x=30.4, 20.5+x=30.4, 20.5+x-20.5=30.4-20.5, x=9.9;(3)0.6×95-4.8x=31.08, 57-4.8x=31.08, 57-4.8x+4.8x=31.08+4.8x, 31.08+4.8x=57, 31.08+4.8x-3...

(1)20:x=5:0.44, 5x=20×0.44, 5x÷5=8.8÷5, x=1.76;(2)8.44.2=x14.4, 4.2x=8.4×14.4,4.2x÷4.2=120.96÷4.2, x=28.8;(3)35x+320x=3, 1520x=3, 1520x÷1520=3÷1520, x=4.

(1)8.4+x=12.5, 8.4+x-8.4=12.5-8.4, x=4.1;(2)7x-3.5x=42, 3.5x=42, 3.5x÷3.5=42÷3.5, x=12;(3)4(2x+5.4)=75.2, 4(2x+5.4)÷4=75.2÷4, 2x+5.4=18.8, 2x+5.4-5.4=18.8-5.4, 2x=13.4, 2x÷2=13.4÷2, x=6.7.

4(x-0.2)=8.4 x-0.2=8.4/4 x-0.2=2.1 x=2.1+0.2 x=2.3

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