问题 解答题
解方程:
1.2X-0.8X-6=168:X=5:0.4  4X十0.7×3=6
1
2
5X+3X=264.
答案

(1)1.2x-0.8x-6=16,

0.4x-6=16,

0.4x-6+6=16+6,

0.4x÷0.4=22÷0.4,

x=55;

(2)8:x=5:0.4,

5x=8×0.4

5x÷5=3.2÷5,

x=0.64;

(3)4x+0.7×3=6

1
2

4x+2.1=6

1
2

4x+2.1-2.1=6

1
2
-2.1,

4x÷4=4.4÷4,

x=1.1;

(4)5x+3x=264,

8x=264,

8x÷8=264÷8,

x=33.

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