脱式计算(能简算的要简算) (1)6.72-2.3÷0.5×0.8 &n...
脱式计算(能简算的要简算)(1)6.72-2.3÷0.5×0.8(2)98-17+18-67(3)910÷[12×(65-310)](4)6.25×0.56+58×3.4...
脱式计算(能简算的要简算) (1)6.72-2.3÷0.5×0.8 (2)98-17+18-67(3)910÷[12×(65-310)](4)6.25×0.56+58×3.4+5×18.
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(1)6.72-2.3÷0.5×0.8
=6.72-4.6×0.8
=6.72-3.68
=3.04;
(2)
?
+
?
=(
+
)-(
+
)
=
-1
=
;
(3)
÷[
×(
?
)]
=
÷[
×
]
=
÷
=
×
=2;
(4)6.25×0.56+
×3.4+5×
=0.625×5.6+
×3.4+
=
×5.6+
×3.4+
=
×(5.6+3.4+1)
=
×10
=
.
=6.72-4.6×0.8
=6.72-3.68
=3.04;
(2)
9 |
8 |
1 |
7 |
1 |
8 |
6 |
7 |
=(
9 |
8 |
1 |
8 |
1 |
7 |
6 |
7 |
=
5 |
4 |
=
1 |
4 |
(3)
9 |
10 |
1 |
2 |
6 |
5 |
3 |
10 |
=
9 |
10 |
1 |
2 |
9 |
10 |
=
9 |
10 |
9 |
20 |
=
9 |
10 |
20 |
9 |
=2;
(4)6.25×0.56+
5 |
8 |
1 |
8 |
=0.625×5.6+
5 |
8 |
5 |
8 |
=
5 |
8 |
5 |
8 |
5 |
8 |
=
5 |
8 |
=
5 |
8 |
=
25 |
4 |
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