1. 88 + 89 + 90 + ⋯ + 97 + 98的和是( )。
答案
1023
2. 从1000里连续减去5个98,结果是( )。
答案
510
1. 直接写出得数。
160÷20 = 75÷5 = 0÷18 =
300÷60 = 4×15 = 90×40 =
80÷16 = 25×4 = 150 + 150 =
75 + 25 = 32×3 = 60÷5 =
160÷20 = 75÷5 = 0÷18 =
300÷60 = 4×15 = 90×40 =
80÷16 = 25×4 = 150 + 150 =
75 + 25 = 32×3 = 60÷5 =
答案
略
2. 用计算器计算下面各题。
345×27−315 = 142857×4 + 285714 =
5880÷14 + 80 = 6708×4278−6824 =
50240÷(459−299) = 9375÷25−375 =
19188÷(421−380) = (3790 + 7895)÷57 =
(4574−2394)×24 = 375×(26×12) =
345×27−315 = 142857×4 + 285714 =
5880÷14 + 80 = 6708×4278−6824 =
50240÷(459−299) = 9375÷25−375 =
19188÷(421−380) = (3790 + 7895)÷57 =
(4574−2394)×24 = 375×(26×12) =
答案
9000 857142 500 28690000 314 0 468 205 52320 117000
3. 用计算器计算每组前4题,找出规律后接着填。
(1) 143×1×7 = ( )
143×2×7 = ( )
143×3×7 = ( )
143×4×7 = ( )
143×( )×7 = 5005
143×( )×7 = 6006
143×( )×7 = ( )
( )×8×7 = ( )
( )×( )×( ) = 9009
(2) 1 + 121×9 = ( )
2 + 232×9 = ( )
3 + 343×9 = ( )
4 + 454×9 = ( )
( ) + 565×9 = ( )
6 + ( )×( ) = ( )
( ) + ( )×9 = 7090
( ) + ( )×( ) = 8090
(1) 143×1×7 = ( )
143×2×7 = ( )
143×3×7 = ( )
143×4×7 = ( )
143×( )×7 = 5005
143×( )×7 = 6006
143×( )×7 = ( )
( )×8×7 = ( )
( )×( )×( ) = 9009
(2) 1 + 121×9 = ( )
2 + 232×9 = ( )
3 + 343×9 = ( )
4 + 454×9 = ( )
( ) + 565×9 = ( )
6 + ( )×( ) = ( )
( ) + ( )×9 = 7090
( ) + ( )×( ) = 8090
答案
略
登录