《2025年口算训练四年级数学下册人教版升级版》

$100 - 2×9 =$ $600 + 7×2 =$ $15×3 + 5 =$
$30 - 3×5 =$ $20×8 + 40 =$ $420 - 5×3 =$
$6×(100 - 50) =$ $(820 - 120)×9 =$ $(5 + 30)÷5 =$

答案：

直接写出得数。
$50 - 24÷6 =$ $400 - 3×7 =$ $(75 + 33)÷9 =$
$(10 + 1)×22 =$ $7÷1 + 77 =$ $25×(12 + 16) =$
$6×(0÷3) =$ $42÷6 + 97 =$ $(5 + 30)÷5 =$
$41×8 + 20 =$ $110×9 + 10 =$ $20÷2 + 8 =$
$1000 - 8×8 =$ $(10 + 8)×125 =$ $125 - 25÷5 =$
$(90 - 36)÷6 =$ $(1000 - 790)÷7 =$ $25×4 + 16 =$
$300×2 + 60 =$ $4×15 + 85 =$ $120÷4÷5 =$
$260 + 26×100 =$ $840 - 24×6 =$ $40 - 40÷2 =$
$35 + 16×3 =$ $25×6 + 156 =$ $1234 + (76 - 76) =$

答案：

根据各部分间的关系，写出另外两个算式。
$29×18 = 522$ $156 + 98 = 254$
$1817÷23 = 79$ $897 - 78 = 819$

答案：