1. 用计算器计算。


(1)
$\begin{array}{c}\boxed{3478}+\boxed{5796}\\\boxed{10000}-\boxed{}\\\boxed{}+\boxed{6358}\\\boxed{}\end{array}\\\boxed{} $
(2)
$\begin{array}{c}\boxed{6538}-\boxed{3287}\\\boxed{5328}+\boxed{}\\\boxed{}-\boxed{2837}\\\boxed{}\end{array}\\\boxed{} $

(1) 3478 + 5796 = 9274
10000 - 9274 = 726
726 + 6358 = 7084
答案：7084
(2) 6538 - 3287 = 3251
5328 + 3251 = 8579
8579 - 2837 = 5742
答案：5742

2. 用计算器计算。
(1)$98736+34210= $
(2)$736×(539-198)= $
(3)$14421÷(431+196)= $
(4)$13950-(690+950)= $
(5)$125×(1600÷40)= $
(6)$9782-(683-367)= $
(7)$8792+1028÷4= $
先用计算器算出每列前三个算式的得数,然后根据规律直接写出其他算式的得数。
$99×3= $ $99×6= $

$999×3= $ $999×6= $
$9999×3= $ $9999×6= $
$99999×3= $ $99999×6= $
$999999×3= $ $999999×6= $
$9999999×3= $ $9999999×6= $

(1) $ 98736 + 34210 = 132946 $
(2) $ 736 × (539 - 198) = 736 × 341 = 250976 $
(3) $ 14421 ÷ (431 + 196) = 14421 ÷ 627 = 23 $
(4) $ 13950 - (690 + 950) = 13950 - 1640 = 12310 $
(5) $ 125 × (1600 ÷ 40) = 125 × 40 = 5000 $
(6) $ 9782 - (683 - 367) = 9782 - 316 = 9466 $
(7) $ 8792 + 1028 ÷ 4 = 8792 + 257 = 9049 $
规律题：
$ 99 × 3 = 297 $
$ 99 × 6 = 594 $
$ 999 × 3 = 2997 $
$ 999 × 6 = 5994 $
$ 9999 × 3 = 29997 $
$ 9999 × 6 = 59994 $
$ 99999 × 3 = 299997 $
$ 99999 × 6 = 599994 $
$ 999999 × 3 = 2999997 $
$ 999999 × 6 = 5999994 $
$ 9999999 × 3 = 29999997 $
$ 9999999 × 6 = 59999994 $