新叶821031
幼苗
共回答了16个问题采纳率:93.8% 举报
(1)78x+4=82,
78x+4-4=82-4,
78x=78,
78x÷78=78÷78,
x=1;
(2)100÷100x=10,
100÷100x×100x=10×100x,
100=1000x,
100÷1000=1000x÷1000,
x=0.1;
(3)x-
4
9 +
1
6 =
5
6 ,
x-
5
18 =
5
6 ,
x-
5
18 +
5
18 =
5
6 +
5
18 ;
x=1
1
9 ;
(4)9x-10-8x=10,
x-10=10,
x-10+10=10+10,
x=20;
(5)5×8.5-10x=17.5,
42.5-10x+10x=17.5+10x,
42.5-17.5=17.5+10x-17.5,
25=10x,
25÷10=10x÷10,
x=2.5;
(6)(y+8)÷0.25=100,
(y+8)÷0.25×0.25=100×0.25,
y+8-8=25-8,
y=17;
(7)3x+24=5x+23,
3x+24-3x=5x+23-3x,
24-23=2x+23-23,
1=2x,
1÷2=2x÷2,
x=0.5;
(8)(y+3.5)×8=10y,
8y+28-8y=10y-8y,
28=2y,
28÷2=2y÷2,
y=14.
1年前
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