题目内容
计算下面各题.
(1)递等式计算:
÷(
+
)×
(2)解方程:
×(x+50%)=16
(3)简便计算:
×(1-75%)+
+0.25×
49.5×13.5+50.5×13-0.5×49.5.
(1)递等式计算:
| 3 |
| 7 |
| 11 |
| 6 |
| 2 |
| 3 |
| 10 |
| 3 |
(2)解方程:
| 4 |
| 5 |
(3)简便计算:
| 7 |
| 8 |
| 1 |
| 4 |
| 1 |
| 8 |
49.5×13.5+50.5×13-0.5×49.5.
(1)
| 3 |
| 7 |
| 11 |
| 6 |
| 2 |
| 3 |
| 10 |
| 3 |
=
| 3 |
| 7 |
| 5 |
| 2 |
| 10 |
| 3 |
=
| 6 |
| 35 |
| 10 |
| 3 |
=
| 4 |
| 7 |
(2)
| 4 |
| 5 |
| 4 |
| 5 |
| 4 |
| 5 |
| 4 |
| 5 |
x+50%=20,
x+50%-50%=20-50%,
x=19.5;
(3)
| 7 |
| 8 |
| 1 |
| 4 |
| 1 |
| 8 |
=
| 7 |
| 8 |
| 1 |
| 8 |
=(
| 7 |
| 8 |
| 1 |
| 8 |
=2×0.25,
=0.5;
49.5×13.5+50.5×13-0.5×49.5,
=49.5×13.5-0.5×49.5+50.5×13,
=49.5×(13.5-0.5)+50.5×13,
=49.5×13+50.5×13,
=(49.5+50.5)×13,
=100×13,
=1300.
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