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用竖式计算.105×7=238×4=198×7=458×6

(1)105×7=735(2)238×4=952(3)198×7=1386(4)458×6=2748

7.4 * 13 222 74 = 962 13 * 7.6 78 91 =988

(1)702×7=4914;(2)782÷6=130…2;(3)905÷7=129…2;(4)420×5=2100;(5)6×407=2442;(6)891÷4=222…3.

8×32=25643×7=3014×836=3344245×9=22059×332=2988543×6=3258 8×255=2040 7×914=6398

7/8×6/7×4/9 =6/8X4/9 =3/4X4/9 =1/3

12×4=48, 47×2=94, 25×3=75, 29×3=87, 72×6=432, 16×4=64, 758×3=2274, 406×7=2842, 560×4=2240.

69×5=345; 91÷7=13; 63÷4=15…3; 验算: 534×6=3204; 950×8=7600; 409×4=1636.

679×6=4074;(2)328×7=2296;(3)504×7=3528;(4)624×8=4992;(5)512×6=3072;(6)453×8=3624;(7)507×7=3549;(8)850×6=5100.

(1)108×7=756(2)115×6=690(3)6×29×5=870(4)386+265+127=778(5)846-288+426=984

0.37×0.4=0.148,1.06×25=26.5,27×0.43=11.61,0.6×0.39=0.234,1.7×0.86=1.462,1.8×2.3=4.14,2.07×53=109.71,0.015×2.4=0.036,3.4×1.6=5.44,1.08×5.2=5.616,1.25×3.6=4.5,3.75×0.24=0.9.

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