问题
解答题
解方程: 1.2X-0.8X-6=168:X=5:0.4 4X十0.7×3=6
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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
-2.1,1 2
4x÷4=4.4÷4,
x=1.1;
(4)5x+3x=264,
8x=264,
8x÷8=264÷8,
x=33.