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20以内减法练习题(破十法)进位加法(凑十法口诀:看大数,分小数,凑成十,算得数。)退 位减法(破十法口诀:看大数,分出10,减小数,加剩数。15 9 =14 9 =13 - 9 =12 9 =15 8 二16 8 =11 9 =16 7 =14 8 =14- 7 = 1 / 14Fok5IIX2II、6II cniiiiiiGJI65 II5I9II9ro9IIGO5I9II6II6I7II69IIGO9II7II3I00IIFoX4II66II9IIGO9IIFoFoL00II5II4II6I00IIcnooii00II2I9IIFo7II7II49IIGOII5II007IIro II(JI Foi>oii3I00IIFoiiL00II5II4II5II7IIroIIII I9II4II 9 II465I9II69II5II7II3I00II3I5II2I3IIFo25II5II3I00II2I3IIFo5II5II3 H 二 14 二 4. OIGO 9 IIIIII9II4II