dygrlc
春芽
共回答了18个问题采纳率:88.9% 举报
(1)4
1
5 -2
3
4 +
5
12 ,
=4
12
60 -2
36
60 +
25
60 ,
=(4
12
60 +
25
60 )-2
36
60 ,
=5
37
60 -2
36
60 ,
=3
1
60 ;
(2)9999×36+6666×96,
=3333×3×36+3333×2×96,
=3333×108+3333×192,
=3333×(108+192),
=3333×300,
=999900;
(3)12
2
5 -2
2
5 ×3
3
4 ÷2
1
2 ,
=12
2
5 -
12
5 ×
15
4 ×
2
5 ,
=
62
5 -
18
5 ,
=
44
5 ;
(4)3.14×3.2+5.8×3.14+3.14,
=3.14×(3.2+5.8+1),
=3.14×10,
=31.4;
(5)783×
3
8 -37.5%+21.8×3.75,
=783×0.375-0.375+218×0.375,
=(783-1+218)×0.375,
=1000×0.375,
=375;
(6)1+2-3-4+5+6-7-8+…-1983-1984+1985+1986,
=1+(2-3-4+5)+(6-7-8+9)…+(1982-1983-1984+1985)+1986,
=1+0+0…+1986,
=1987.
1年前
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