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能简算的要简算.(1)4.82×12.5×8(2)18×57−5×47(3)19971998×998(4)(8.3×35.7+35.7×1.7)÷3.57.
题目详情
能简算的要简算.
(1)4.82×12.5×8
(2)18×
−5×
(3)
×998
(4)(8.3×35.7+35.7×1.7)÷3.57.
(1)4.82×12.5×8
(2)18×
5 |
7 |
4 |
7 |
(3)
1997 |
1998 |
(4)(8.3×35.7+35.7×1.7)÷3.57.
▼优质解答
答案和解析
(1)4.82×12.5×8,
=4.82×(12.5×8),
=4.82×100,
=482;
(2)18×
−5×
,
=
−
,
=
,
=10;
(3)
×998,
=(1-
)×998,
=1×998-
×998,
=998−
,
=997
;
(4)(8.3×35.7+35.7×1.7)÷3.57,
=(8.3+1.7)×35.7÷3.57,
=10×35.7÷3.57,
=357÷3.57,
=100.
=4.82×(12.5×8),
=4.82×100,
=482;
(2)18×
5 |
7 |
4 |
7 |
=
90 |
7 |
20 |
7 |
=
70 |
7 |
=10;
(3)
1997 |
1998 |
=(1-
1 |
1998 |
=1×998-
1 |
1998 |
=998−
998 |
1998 |
=997
500 |
999 |
(4)(8.3×35.7+35.7×1.7)÷3.57,
=(8.3+1.7)×35.7÷3.57,
=10×35.7÷3.57,
=357÷3.57,
=100.
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