《2025年心算口算巧算三年级下册北师大版》

① 看图填一填。
＜svg width="80" height="80" viewBox="0 0 80 80" xmlns="http://www.w3.org/2000/svg"＞
＜rect x="10" y="10" width="60" height="60" fill="white" stroke="black" stroke-width="1"/＞
＜line x1="30" y1="10" x2="30" y2="70" stroke="black" stroke-width="1"/＞
＜line x1="50" y1="10" x2="50" y2="70" stroke="black" stroke-width="1"/＞
＜line x1="10" y1="30" x2="70" y2="30" stroke="black" stroke-width="1"/＞
＜line x1="10" y1="50" x2="70" y2="50" stroke="black" stroke-width="1"/＞
＜rect x="10" y="10" width="20" height="20" fill="gray"/＞
＜rect x="30" y="10" width="20" height="20" fill="gray"/＞
＜rect x="10" y="30" width="20" height="20" fill="gray"/＞
＜rect x="30" y="30" width="20" height="20" fill="gray"/＞
＜text x="40" y="95" text-anchor="middle" font-size="12"＞$\frac{(\quad)}{9}$＜/text＞
＜/svg＞
＜svg width="60" height="80" viewBox="0 0 60 80" xmlns="http://www.w3.org/2000/svg"＞
＜circle cx="30" cy="30" r="25" fill="white" stroke="black" stroke-width="1"/＞
＜line x1="30" y1="5" x2="30" y2="55" stroke="black" stroke-width="1"/＞
＜line x1="5" y1="30" x2="55" y2="30" stroke="black" stroke-width="1"/＞
＜line x1="12" y1="12" x2="48" y2="48" stroke="black" stroke-width="1"/＞
＜line x1="12" y1="48" x2="48" y2="12" stroke="black" stroke-width="1"/＞
＜path d="M30,5 L48,12 L30,30 Z" fill="gray"/＞
＜path d="M48,48 L30,30 L48,12 Z" fill="gray"/＞
＜text x="30" y="95" text-anchor="middle" font-size="12"＞$\frac{(\quad)}{6}$＜/text＞
＜/svg＞
＜svg width="60" height="80" viewBox="0 0 60 80" xmlns="http://www.w3.org/2000/svg"＞
＜polygon points="30,10 10,60 50,60" fill="white" stroke="black" stroke-width="1"/＞
＜line x1="30" y1="10" x2="30" y2="60" stroke="black" stroke-width="1"/＞
＜line x1="10" y1="60" x2="50" y2="60" stroke="black" stroke-width="1"/＞
＜polygon points="30,35 20,60 40,60" fill="gray"/＞
＜text x="30" y="95" text-anchor="middle" font-size="12"＞$\frac{(\quad)}{4}$＜/text＞
＜/svg＞
＜svg width="60" height="80" viewBox="0 0 60 80" xmlns="http://www.w3.org/2000/svg"＞
＜polygon points="30,10 15,30 15,50 30,70 45,50 45,30" fill="white" stroke="black" stroke-width="1"/＞
＜line x1="30" y1="10" x2="30" y2="70" stroke="black" stroke-width="1"/＞
＜line x1="15" y1="30" x2="45" y2="50" stroke="black" stroke-width="1"/＞
＜line x1="15" y1="50" x2="45" y2="30" stroke="black" stroke-width="1"/＞
＜polygon points="30,10 45,30 30,30" fill="gray"/＞
＜polygon points="45,30 30,50 45,50" fill="gray"/＞
＜polygon points="30,50 15,50 30,70" fill="gray"/＞
＜text x="30" y="95" text-anchor="middle" font-size="12"＞$\frac{(\quad)}{6}$＜/text＞
＜/svg＞

答案： $\frac{4}{9}$；$\frac{2}{6}$；$\frac{1}{4}$；$\frac{3}{6}$

② 脱式计算。
700÷4÷5　　　　248÷4×5　　　　37×5×2
(44＋66)×3　　　　224÷(2×4)　　　　625÷(25÷5)
27×8×7　　　　56×(36－12)　　　　48×9÷6

答案： 700÷4÷5
=700÷20
=35
248÷4×5
=62×5
=310
37×5×2
=37×10
=370
(44＋66)×3
=110×3
=330
224÷(2×4)
=224÷8
=28
625÷(25÷5)
=625÷5
=125
27×8×7
=216×7
=1512
56×(36－12)
=56×24
=1344
48×9÷6
=432÷6
=72