脱式计算.(能简算的要简算)①1÷0.25+0.25÷1-2.5×0.1②1+2+3+4+5+6+5+4+3+2+16666662③22×4+24×6+

2024-11-02 12:40:55
推荐回答(1个)
回答(1):

①1÷0.25+0.25÷1-2.5×0.1,
=4+0.25-0.25,
=4+(0.25-0.25),
=4+0,
=4;

1+2+3+4+5+6+5+4+3+2+1
6666662

=
36
6666662

=
18×2
3333331×2

=
18
3333331


2
2×4
+
2
4×6
+
2
6×8
+
2
8×10
+
2
10×12

=
1
2
-
1
4
+
1
4
-
1
6
+
1
6
-
1
8
+
1
8
-
1
10
+
1
10
-
1
12

=
1
2
-
1
12

=
5
12


④1÷(1-0.99)-99÷(1-0.999),
=1÷0.01-99÷0.001,
=100-99000,
=-98900.