用递等式计算,能简算的要简算.(18%)(1)25×12-850÷17(2)(3.2÷16+10.8)÷22(3)3.2×12.5×2.5(4)7.05-3.84-0.16-1.05(5)817×9-

题目简介

用递等式计算,能简算的要简算.(18%)(1)25×12-850÷17(2)(3.2÷16+10.8)÷22(3)3.2×12.5×2.5(4)7.05-3.84-0.16-1.05(5)817×9-

题目详情

用递等式计算,能简算的要简算.(18%)
(1)25×12-850÷17
(2)(3.2÷16+10.8)÷22
(3)3.2×12.5×2.5
(4)7.05-3.84-0.16-1.05
(5)
8
17
×9-8÷
17
8

(6)
5
6
×[2÷(
7
8
-
3
4
)].
题型:解答题难度:中档来源:不详

答案

(1)25×12-850÷17
=25×4×3-50,
=300-50,
=250;

(2)(3.2÷16+10.8)÷22
=(0.2+10.8)÷22,
=11÷22,
=0.5;

(3)3.2×12.5×2.5
=0.8×4×12.5×2.5,
=(12.5×0.8)×(2.5×4),
=10×10,
=100;

(4)7.05-3.84-0.16-1.05
=7.05-1.05-(3.84+0.16),
=6-4,
=2;

(5)class="stub"8
17
×9-8÷class="stub"17
8

=class="stub"8
17
×9-8×class="stub"8
17

=(9-8)×class="stub"8
17

=1×class="stub"8
17

=class="stub"8
17


(6)class="stub"5
6
×[2÷(class="stub"7
8
-class="stub"3
4
)]
=class="stub"5
6
×[2÷class="stub"1
8
],
=class="stub"5
6
×16,
=class="stub"40
3

更多内容推荐