用喜欢的方法计算.3.2×1.25×0.25 5.81+2.1-2.09??? 3150×101?3150?? 42÷(12+23) 34×78+18×75%??? (78-516)×(59+23)???
①3.2×1.25×0.25??
=(0.8×1.25)×(4×0.25)
=1;
②5.8+2.1-2.09?????
=7.9-2.09
=5.81;
③
×101-
=
×(101-1)
=
×100
=62;
④42÷(
+
)
=42÷
=42×
=36;
⑤
×
+
×75%???
=
×(
+
)
=
;
⑥(
-
)×(
+
)??
=
×
=
.
=(0.8×1.25)×(4×0.25)
=1;
②5.8+2.1-2.09?????
=7.9-2.09
=5.81;
③
31 |
50 |
31 |
50 |
=
31 |
50 |
=
31 |
50 |
=62;
④42÷(
1 |
2 |
2 |
3 |
=42÷
7 |
6 |
=42×
6 |
7 |
=36;
⑤
3 |
4 |
7 |
8 |
1 |
8 |
=
3 |
4 |
7 |
8 |
1 |
8 |
=
3 |
4 |
⑥(
7 |
8 |
5 |
16 |
5 |
9 |
2 |
3 |
=
9 |
16 |
11 |
9 |
=
11 |
16 |
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