脱式计算(能简算的要简算,写出主要步骤)①3.6-2.8+7.4-7.2②817÷23+123×917+123③(12+13)÷35-1718④18÷[56+(58-13)]⑤3.8×0.73+0.7

题目简介

脱式计算(能简算的要简算,写出主要步骤)①3.6-2.8+7.4-7.2②817÷23+123×917+123③(12+13)÷35-1718④18÷[56+(58-13)]⑤3.8×0.73+0.7

题目详情

脱式计算(能简算的要简算,写出主要步骤)
①3.6-2.8+7.4-7.2         
8
17
÷23+
1
23
×
9
17
+
1
23
③(
1
2
+
1
3
)÷
3
5
-
17
18
        
④18÷[
5
6
+(
5
8
-
1
3
)]
⑤3.8×0.73+0.73×6.2⑥3.27×99+3.27.
题型:解答题难度:中档来源:不详

答案

①3.6-2.8+7.4-7.2
=(3.6+7.4)-(2.8+7.2)
=11-10
=1;

class="stub"8
17
÷23+class="stub"1
23
×class="stub"9
17
+class="stub"1
23

=(class="stub"8
17
+class="stub"9
17
+1)×class="stub"1
23

=2×class="stub"1
23

=class="stub"2
23


③(class="stub"1
2
+class="stub"1
3
)÷class="stub"3
5
-class="stub"17
18

=class="stub"5
6
÷class="stub"3
5
-class="stub"17
18

=class="stub"25
18
-class="stub"17
18

=class="stub"4
9


④18÷[class="stub"5
6
+(class="stub"5
8
-class="stub"1
3
)]
=18÷[class="stub"5
6
+class="stub"7
24
]
=18÷class="stub"27
24

=16;

⑤3.8×0.73+0.73×6.2
=(3.8+6.2)×0.73
=10×0.73
=7.3;

⑥3.27×99+3.27
=3.27×(99+1)
=3.27×100
=327.

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