问题
解答题
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答案
(1)78+x=100,
78+x-78=100-78,
x=22;
(2)5x-2000=6000,
5x-2000+2000=6000+2000,
5x=8000,
5x÷5=8000÷5,
x=1600;
(3)(
-20%)x=55,3 4
(0.75-0.2)x=55,
0.55x=55,
0.55x÷0.55=55÷0.55,
x=100.
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(1)78+x=100,
78+x-78=100-78,
x=22;
(2)5x-2000=6000,
5x-2000+2000=6000+2000,
5x=8000,
5x÷5=8000÷5,
x=1600;
(3)(
-20%)x=55,3 4
(0.75-0.2)x=55,
0.55x=55,
0.55x÷0.55=55÷0.55,
x=100.