怎样简便就怎样计算.(21+71g)×17八8×79+28×八9188×9.8g-88×9.8g29+716+八9+816118×(1g+112)÷112(八.8-712÷2.8)÷112.-数学

题目简介

怎样简便就怎样计算.(21+71g)×17八8×79+28×八9188×9.8g-88×9.8g29+716+八9+816118×(1g+112)÷112(八.8-712÷2.8)÷112.-数学

题目详情

怎样简便就怎样计算.
(21+
7
1g
)×
1
7
8
×
7
9
+
2
8
×
9
1
8
8
×9.8g-
8
8
×9.8g
2
9
+
7
16
+
9
+
8
16
1
18
×(
1
g
+
1
12
÷
1
12
(八.8-7
1
2
÷2.8
÷
1
12
题型:解答题难度:中档来源:不详

答案

(1)(71+class="stub"7
13
)×class="stub"1
7

=71×class="stub"1
7
+class="stub"7
13
×class="stub"1
7

=3+class="stub"1
13

=3class="stub"1
13


(7)class="stub"4
8
×class="stub"7
x
+class="stub"7
8
×class="stub"4
x

=class="stub"4
8
×(class="stub"7
x
+class="stub"7
x

=class="stub"4
8
×1
=class="stub"4
8


(3)1class="stub"8
8
×x.83-class="stub"8
8
×x.83
=(1class="stub"8
8
-class="stub"8
8
)×x.83
=1×x.83
=x.83;

(4)class="stub"7
x
+class="stub"7
16
+class="stub"4
x
+class="stub"8
16

=class="stub"7
x
+class="stub"4
x
+(class="stub"8
16
+class="stub"7
16

=class="stub"7
3
+class="stub"3
4

=class="stub"17
17


(8)class="stub"1
18
×(class="stub"1
3
+class="stub"1
17
)÷class="stub"1
17

=class="stub"1
18
×class="stub"8
17
×17
=class="stub"1
3


(6)(4.8-7class="stub"1
7
÷7.8
÷class="stub"1
17

=(4.8-3)÷class="stub"1
17

=1.8×17
=71.6.

更多内容推荐