文档介绍：用计算器计算练****用计算器计算练****算一算找规律框一框读一读(1) 678 +795 (2) 9023 -1186 (3) 457 ×142 (4) 8624 ÷56 复****用计算器计算 1、比一比,看谁算得又对又快. 34 × 357 - 9018 ÷ 48 - 2922 ÷ 34× 125 3840 12138 3120 65 918 27 3375 练****2. 用计算器计算. 94 × 86 ÷ 47 (394 + 5477) ÷ 57 8450 ÷ 25 - 249 6396 ÷ (520 - 438) ,并找一找各组的规律。 9 × 9 — 1 = 98 × 9 — 2 = 987 × 9 — 3 = 9876 × 9 — 4 = ×— = 80 880 8880 88880 9× 9 — 1 = 98 × 9 — 2 = 987 × 9 — 3 = 9876 × 9 — 4 = ×— = 80 880 8880 88880 9 ×9— 1 = 98 ×9— 2 = 987 × 9 — 3 = 9876 × 9 — 4 = ×— = 80 880 8880 88880 9 × 9 —1= 98 × 9 —2= 987 × 9 — 3 = 9876 × 9 — 4 =×— = 80 880 8880 88880 9 × 9 — 1 = 98 × 9 — 2 = 987 × 9 — 3 = 9876 × 9 — 4 = 98765 × 9 — 5 = 987654 × 9 — 6 = 9876543 × 9 — 7 = 98765432 × 9 — 8 = 80 880 8880 88880 888880 8888880 88888880 888888880 19 + 9 × 9 = 118 + 98 ×9= 1117 + 987 × 9 = 11116 + 9876 × 9 = 111115 + 98765 × 9 = 1111114 + 987654 × 9 = 11111113 + 9876543 × 9 = 111111112 + 98765432 × 9 = 100 1000 10000 100000 1000000 10000000 100000000 1000000000