計算
①
÷[
×(
+
)]
②(0.4+
)÷(
-0.75)×0.5
③1.25+
1×7.4+125%÷
④
393939×899899 |
377377×939393 |
⑤6.6-
1÷(0.375×
+
×0.8)
⑥
5-2.125+(4.75-
3)
⑦
1+[(1.5+
2)÷3.75-
]÷
⑧
+
+
+…+
.
①
÷[
×(
+
)],
=
÷[
×
],
=
÷
,
=
;
②(0.4+
)÷(
-0.75)×0.5,
=
÷
×0.5,
=
×0.5,
=6.4;
③1.25+
1×7.4+125%÷
,
=1.25+1.25×7.4+1.25×1.6,
=1.25×(1+7.4+1.6),
=1.25×10,
=12.5;
④
393939×899899 |
377377×939393 |
,
=
(3×13×10101)×(29×31×1001) |
(13×29×1001)×(3×31×10101) |
,
=
3×13××29×31×1001×10101 |
3×13×29×31×1001×10101 |
,
=1;
⑤6.6-
1÷(0.375×
+
×0.8),
=6.6-
1÷(0.375×0.8+
×0.8),
=6.6-
1÷[(0.375+
)×0.8],
=6.6-
1÷[0.5×0.8],
=6.6-
1÷0.4,
=6.6-4,
=2.6;
⑥
5-2.125+(4.75-
3),
=5.25-2.125+4.75-3.375,
=(5.25+4.75)-(2.125+3.375),
=10-5.5,
=4.5;
⑦
1+[(1.5+
2)÷3.75-
]÷
,
=
1+[
÷3.75-
]÷
,
=
1+[
-
]÷
,
=
1+
÷
,
=
1+
,
=1
;
⑧
+
+
+…+
,
=
×(1-
+
-
+
-
+…+
-
),
=
×(1-
),
=
×
,
=
.
練習(xí)冊系列答案
相關(guān)習(xí)題
科目:小學(xué)數(shù)學(xué)
來源:
題型:
脫式計算,能簡算的要簡算. ①+(-)÷ |
②32×40+450÷18 |
③÷×(+) |
④×+×0.75-75% |
⑤3.6-2.8+3.4-7.2. |
查看答案和解析>>
科目:小學(xué)數(shù)學(xué)
來源:
題型:
計算
①
÷[
×(
+
)]
②(0.4+
)÷(
-0.75)×0.5
③1.25+
1×7.4+125%÷
④
393939×899899 |
377377×939393 |
⑤6.6-
1÷(0.375×
+
×0.8)
⑥
5-2.125+(4.75-
3)
⑦
1+[(1.5+
2)÷3.75-
]÷
⑧
+
+
+…+
.
查看答案和解析>>
科目:小學(xué)數(shù)學(xué)
來源:不詳
題型:解答題
計算
①
÷[
×(
+
)]
②(0.4+
)÷(
-0.75)×0.5
③1.25+
1×7.4+125%÷
④
393939×899899 |
377377×939393 |
⑤6.6-
1÷(0.375×
+
×0.8)
⑥
5-2.125+(4.75-
3)
⑦
1+[(1.5+
2)÷3.75-
]÷
⑧
+
+
+…+
.
查看答案和解析>>