
计算下面各题能简便的用简便方法计算.3.7×99+3.7 &...
计算下面各题能简便的用简便方法计算.3.7×99+3.70.4×80×2.5×0.125920÷[12×(25+45)]6÷[(35-110)÷1.2]...
计算下面各题能简便的用简便方法计算.3.7×99+3.7 0.4×80×2.5×0.125 920÷[12×( 25+45)] 6÷[( 35-110)÷1.2]
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(1)3.7×99+3.7
=3.7×(99+1)
=3.7×100
=370;
(2)0.4×80×2.5×0.125
=(0.4×2.5)×(80×0.125)
=1×10
=10;
(3)
÷[
×(
+
)]
=
÷[
×
]
=
÷
=
;
(4)6÷[(
-
)÷1.2]
=6÷[
÷1.2]
=6÷
=14
.
=3.7×(99+1)
=3.7×100
=370;
(2)0.4×80×2.5×0.125
=(0.4×2.5)×(80×0.125)
=1×10
=10;
(3)
9 |
20 |
1 |
2 |
2 |
5 |
4 |
5 |
=
9 |
20 |
1 |
2 |
6 |
5 |
=
9 |
20 |
3 |
5 |
=
3 |
4 |
(4)6÷[(
3 |
5 |
1 |
10 |
=6÷[
1 |
2 |
=6÷
5 |
12 |
=14
2 |
5 |
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