用简便的方法计算. 849÷[98-(18+37)] (35-13)×15 13-3.79+9.7-6.21 8×0.4×12.5×2.
用简便的方法计算.849÷[98-(18+37)](35-13)×1513-3.79+9.7-6.218×0.4×12.5×2.5....
用简便的方法计算. 849÷[98-(18+37)] (35-13)×15 13-3.79+9.7-6.21 8×0.4×12.5×2.5.
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(1)
÷[
-(
+
)],
=
÷[
-
-
],
=
÷[1-
],
=
÷
,
=
×
,
=
;
(2)(
-
)×15,
=
×15-
×15,
=9-5,
=4;
(3)13-3.79+9.7-6.21,
=13+9.7-(3.79+6.21),
=22.7-10,
=12.7;
(4)8×0.4×12.5×2.5,
=8×12.5×(0.4×2.5),
=100×1,
=100.
8 |
49 |
9 |
8 |
1 |
8 |
3 |
7 |
=
8 |
49 |
9 |
8 |
1 |
8 |
3 |
7 |
=
8 |
49 |
3 |
7 |
=
8 |
49 |
4 |
7 |
=
8 |
49 |
7 |
4 |
=
2 |
7 |
(2)(
3 |
5 |
1 |
3 |
=
3 |
5 |
1 |
3 |
=9-5,
=4;
(3)13-3.79+9.7-6.21,
=13+9.7-(3.79+6.21),
=22.7-10,
=12.7;
(4)8×0.4×12.5×2.5,
=8×12.5×(0.4×2.5),
=100×1,
=100.
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