题目内容
| 我能很快算出下面的题目相信你也能行. ①9
| ②7.8×
| ③34.7-
| ④(
| ||||||||||||||||
| ⑤0.25×32×12.5 | ⑥
| ⑦
| ⑧16:x=0.75:
|
①9
-(3
+0.4),
=9
-3
-
,
=(9
-
)-3
,
=9-3
,
=5
;
②7.8×
+2.2×20%,
=7.8×0.2+2.2×0.2,
=(7.8+2.2)×0.2,
=10×0.2,
=2;
③34.7-
+65.3-
,
=(34.7+65.3)-(
+
),
=100-1,
=99;
④(
+
-
)×12,
=
×12+
×12-
×12,
=9+22-6.5,
=24.5;
⑤0.25×32×12.5,
=0.25×4×8×12.5,
=(0.25×4)×(8×12.5),
=1×100,
=100;
⑥
×[
-(
-
)],
=
×[
-(
-
)],
=
×[
-
],
=
×[
-
],
=
×
,
=
;
⑦
x+
x=1.4,
(
+
)x=1.4,
x=1.4,
x×
=1.4×
,
x=
;
⑧16:x=0.75:
,
0.75x=16×
,
0.75x=30,
0.75x÷0.75=30÷0.75,
x=40.
| 2 |
| 5 |
| 3 |
| 7 |
=9
| 2 |
| 5 |
| 3 |
| 7 |
| 2 |
| 5 |
=(9
| 2 |
| 5 |
| 2 |
| 5 |
| 3 |
| 7 |
=9-3
| 3 |
| 7 |
=5
| 4 |
| 7 |
②7.8×
| 1 |
| 5 |
=7.8×0.2+2.2×0.2,
=(7.8+2.2)×0.2,
=10×0.2,
=2;
③34.7-
| 7 |
| 15 |
| 8 |
| 15 |
=(34.7+65.3)-(
| 7 |
| 15 |
| 8 |
| 15 |
=100-1,
=99;
④(
| 3 |
| 4 |
| 11 |
| 6 |
| 13 |
| 24 |
=
| 3 |
| 4 |
| 11 |
| 6 |
| 13 |
| 24 |
=9+22-6.5,
=24.5;
⑤0.25×32×12.5,
=0.25×4×8×12.5,
=(0.25×4)×(8×12.5),
=1×100,
=100;
⑥
| 7 |
| 12 |
| 3 |
| 4 |
| 11 |
| 20 |
| 1 |
| 2 |
=
| 7 |
| 12 |
| 3 |
| 4 |
| 11 |
| 20 |
| 10 |
| 20 |
=
| 7 |
| 12 |
| 3 |
| 4 |
| 1 |
| 20 |
=
| 7 |
| 12 |
| 15 |
| 20 |
| 1 |
| 20 |
=
| 7 |
| 12 |
| 7 |
| 10 |
=
| 49 |
| 120 |
⑦
| 1 |
| 3 |
| 5 |
| 9 |
(
| 1 |
| 3 |
| 5 |
| 9 |
| 8 |
| 9 |
| 8 |
| 9 |
| 9 |
| 8 |
| 9 |
| 8 |
x=
| 63 |
| 40 |
⑧16:x=0.75:
| 15 |
| 8 |
0.75x=16×
| 15 |
| 8 |
0.75x=30,
0.75x÷0.75=30÷0.75,
x=40.
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