题目内容
计算(写出主要过程,其中第①④题简算)
①3.6-2.8+7.4-7.2
②(1-0.05)÷1.9+0.1
③
×[1-(
-
)]
④
÷23+
×
.
①3.6-2.8+7.4-7.2
②(1-0.05)÷1.9+0.1
③
| 4 |
| 29 |
| 3 |
| 4 |
| 3 |
| 8 |
④
| 8 |
| 17 |
| 1 |
| 23 |
| 9 |
| 17 |
①3.6-2.8+7.4-7.2
=(3.6+7.4)-(2.8+7.2)
=11-10
=1;
②(1-0.05)÷1.9+0.1
=0.95÷1.9+0.1
=0.5+0.1
=0.6;
③
×[1-(
-
)]
=
×[1-
]
=
×
=
;
④
÷23+
×
=(
+
)×
=1×
=
.
=(3.6+7.4)-(2.8+7.2)
=11-10
=1;
②(1-0.05)÷1.9+0.1
=0.95÷1.9+0.1
=0.5+0.1
=0.6;
③
| 4 |
| 29 |
| 3 |
| 4 |
| 3 |
| 8 |
=
| 4 |
| 29 |
| 3 |
| 8 |
=
| 4 |
| 29 |
| 5 |
| 8 |
=
| 5 |
| 58 |
④
| 8 |
| 17 |
| 1 |
| 23 |
| 9 |
| 17 |
=(
| 8 |
| 17 |
| 9 |
| 17 |
| 1 |
| 23 |
=1×
| 1 |
| 23 |
=
| 1 |
| 23 |
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