问题
解答题
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答案
(1)0.8x+0.4x=1.2,
1.2x=1.2,
1.2x÷1.2=1.2÷1.2,
x=1;
(2)32x-9x-13x=60,
10x=60,
10x÷10=60÷10,
x=6;
(3)0.7x+4=1027,
0.7x+4-4=1027-4,
0.7x=1023.
0.7x÷0.7=1023÷0.7,
x=1461
;3 7
(4)x-3×9=8,
x-27=8,
z-27+27=8+27,
x=35;
(5)15x-7.5x=15,
7.5x=15,
7.5x÷7.5=15÷7.5,
x=2;
(6)x-0.8x+0.7x=8.1,
0.9x=8.1,
0.9x÷0.9=8.1÷0.9,
x=9.