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共回答了19个问题采纳率:94.7% 举报
(1)2010-4848÷9.6×2.4,
=2010-505×2.4,
=2010-1212,
=798;
(2)(
3
4 -
3
4 ×
2
5 )÷
1
5 ,
=(
3
4 -
3
10 ) ÷
1
5 ,
=
9
20 ÷
1
5 ,
=2.25;
(3)
8
9 ×[
3
4 -(
15
16 -
3
4 )],
=
8
9 ×[
3
4 -
3
16 ],
=
8
9 ×
9
16 ,
=0.5;
(4)(
2
3 +
5
12 +
1
19 )×12+
7
19 ,
=
2
3 ×12 +
5
12 ×12 +
1
19 ×12 +
7
19 ,
=8+5+(
12
19 +
7
19 ),
=13+1,
=14;
(5)设要求的数是x,
18+[
2
5 ×1.25+(
1
2 +x×12)]÷0.125=86,
18+[
2
5 ×1.25+
1
2 +12x]÷0.125=86,
18+[1+12x]÷0.125=86,
18+8+96x=86,
26+96x-26=86-26,
96x÷96=60÷96,
x=0.625.
答:要求的数是0.625,
故答案为:798,2.25,0.5,14,0.625.
1年前
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