题目内容
直接写数对又快
1÷
×
=
4×0.8×2.5×12.5=
112×(24-4
)÷2.4=
6
×121+444÷
+67×21.2=
13
+86
×0.25+0.625×86
×0.125=
1÷
| 2 |
| 3 |
| 3 |
| 2 |
4×0.8×2.5×12.5=
112×(24-4
| 4 |
| 5 |
6
| 7 |
| 10 |
| 40 |
| 99 |
13
| 4 |
| 19 |
| 15 |
| 19 |
| 15 |
| 19 |
(1)1÷
×
,
=
×
,
=
;
(2)4×0.8×2.5×12.5,
=(4×2.5)×(0.8×12.5),
=10×10,
=100;
(3)112×(24-4
)÷2.4,
=112×
×
,
=112×(
×
),
=112×8,
=896;
(4)6
×121+444÷
+67×21.2,
=6.7×121+67×21.2+444×
,
=67×12.1+67×21.2+444×
,
=67×(12.1+21.2)+11.1×99,
=67×33.3+33.3×33,
=(67+33)×33.3,
=100×33.3,
=3330;
(5)13
+86
×0.25+0.625×86
+0.125×86
,
=13
+(0.25+0.625+0.125)×86
,
=13
+1×86
,
=13
+86
,
=100.
| 2 |
| 3 |
| 3 |
| 2 |
=
| 3 |
| 2 |
| 3 |
| 2 |
=
| 9 |
| 4 |
(2)4×0.8×2.5×12.5,
=(4×2.5)×(0.8×12.5),
=10×10,
=100;
(3)112×(24-4
| 4 |
| 5 |
=112×
| 96 |
| 5 |
| 5 |
| 12 |
=112×(
| 96 |
| 5 |
| 5 |
| 12 |
=112×8,
=896;
(4)6
| 7 |
| 10 |
| 40 |
| 99 |
=6.7×121+67×21.2+444×
| 99 |
| 40 |
=67×12.1+67×21.2+444×
| 99 |
| 40 |
=67×(12.1+21.2)+11.1×99,
=67×33.3+33.3×33,
=(67+33)×33.3,
=100×33.3,
=3330;
(5)13
| 4 |
| 19 |
| 15 |
| 19 |
| 15 |
| 19 |
| 15 |
| 19 |
=13
| 4 |
| 19 |
| 15 |
| 19 |
=13
| 4 |
| 19 |
| 15 |
| 19 |
=13
| 4 |
| 19 |
| 15 |
| 19 |
=100.
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