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40 以内数的减法 {:[40-17=23,33-21=],[36-19=11,36-20=16],[37-16=21,38-22=16],[32-14=22,39-20=19],[134-17=17,40-19=11],[40-19=19,31-15=16],[35-20=15,32-13=19],[28-24=14,37-17=20],[40-27=13,31-20=17],[36-18=18,38-26=12],[39-19=20,39-29=10],[40-23=17,36-23=13]:}

4040 以内数的减法\newline40−17=2333−21=36−19=1136−20=1637−16=2138−22=1632−14=2239−20=19134−17=1740−19=1140−19=1931−15=1635−20=1532−13=1928−24=1437−17=2040−27=1331−20=1736−18=1838−26=1239−19=2039−29=1040−23=1736−23=13 \begin{array}{ll} 40-17=23 & 33-21= \\ 36-19=11 & 36-20=16 \\ 37-16=21 & 38-22=16 \\ 32-14=22 & 39-20=19 \\ 134-17=17 & 40-19=11 \\ 40-19=19 & 31-15=16 \\ 35-20=15 & 32-13=19 \\ 28-24=14 & 37-17=20 \\ 40-27=13 & 31-20=17 \\ 36-18=18 & 38-26=12 \\ 39-19=20 & 39-29=10 \\ 40-23=17 & 36-23=13 \end{array}

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Q. 4040 以内数的减法\newline40−17=2333−21=36−19=1136−20=1637−16=2138−22=1632−14=2239−20=19134−17=1740−19=1140−19=1931−15=1635−20=1532−13=1928−24=1437−17=2040−27=1331−20=1736−18=1838−26=1239−19=2039−29=1040−23=1736−23=13 \begin{array}{ll} 40-17=23 & 33-21= \\ 36-19=11 & 36-20=16 \\ 37-16=21 & 38-22=16 \\ 32-14=22 & 39-20=19 \\ 134-17=17 & 40-19=11 \\ 40-19=19 & 31-15=16 \\ 35-20=15 & 32-13=19 \\ 28-24=14 & 37-17=20 \\ 40-27=13 & 31-20=17 \\ 36-18=18 & 38-26=12 \\ 39-19=20 & 39-29=10 \\ 40-23=17 & 36-23=13 \end{array}
  1. Solve first subtraction problem: Solve the first subtraction problem.\newlineCalculate 40−1740 - 17.\newline40−17=2340 - 17 = 23.\newlineCheck for math errors.
  2. Calculate 40−1740 - 17: Solve the second subtraction problem.\newlineCalculate 33−2133 - 21.\newline33−21=1233 - 21 = 12.\newlineCheck for math errors.

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