用递等式计算,能简算的要简算.(1)46×8-120÷15(2)34+2917+14+3817(3)(12.5×8-40)÷0.6(4)23+(45-23)×53(5)3.4×2.77+0.23×3.

题目简介

用递等式计算,能简算的要简算.(1)46×8-120÷15(2)34+2917+14+3817(3)(12.5×8-40)÷0.6(4)23+(45-23)×53(5)3.4×2.77+0.23×3.

题目详情

用递等式计算,能简算的要简算.
(1)46×8-120÷15
(2)
3
4
+2
9
17
+
1
4
+3
8
17

(3)(12.5×8-40)÷0.6
(4)
2
3
+(
4
5
-
2
3
5
3

(5)3.4×2.77+0.23×3.4
(6)(
5
12
+
1
9
+
3
8
)×72.
题型:解答题难度:中档来源:不详

答案

(1)46×8-120÷15,
=368-8,
=360;

(2)class="stub"3
4
+2class="stub"9
17
+class="stub"1
4
+3class="stub"8
17

=(class="stub"3
4
+class="stub"1
4
)+(2class="stub"9
17
+3class="stub"8
17
),
=1+6,
=7;

(3)(12.5×8-40)÷0.6,
=(100-40)÷0.6,
=60÷0.6,
=100;

(4)class="stub"2
3
+(class="stub"4
5
-class="stub"2
3
)×class="stub"5
3

=class="stub"2
3
+class="stub"2
15
×class="stub"5
3

=class="stub"2
3
+class="stub"2
9

=class="stub"8
9


(5)3.4×2.77+0.23×3.4
=(2.77+0.23)×3.4,
=3×3.4,
=10.2;

(6)(class="stub"5
12
+class="stub"1
9
+class="stub"3
8
)×72
=class="stub"5
12
×
72+class="stub"1
9
×72+class="stub"3
8
×72,
=30+8+27,
=65.

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