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+
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+26×8+28×1...
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+26×8+28×10+210×12④1÷(1-0.99)-99÷(1-0.999)
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①1÷0.25+0.25÷1-2.5×0.1,
=4+0.25-0.25,
=4+(0.25-0.25),
=4+0,
=4;
②
,
=
,
=
,
=
;
③
+
+
+
+
,
=
-
+
-
+
-
+
-
+
-
,
=
-
,
=
;
④1÷(1-0.99)-99÷(1-0.999),
=1÷0.01-99÷0.001,
=100-99000,
=-98900.
=4+0.25-0.25,
=4+(0.25-0.25),
=4+0,
=4;
②
1+2+3+4+5+6+5+4+3+2+1 |
6666662 |
=
36 |
6666662 |
=
18×2 |
3333331×2 |
=
18 |
3333331 |
③
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.
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