一口算:
80×10 = 60×20= 50×40= 24×10 =
700×20= 50×60= 90×90 = 40×80 = 90×50 = 80×20 = 11×70 = 60×60= 40×90= 23×20= 90= 31×20= 20×70= 80×50 = 40×30= 60×80= 22×30= 20×90= 90×80 = 33×30= 40×70 = 70×20 = 22×30= 12×200= 200×40= 50×30= 70×70= 20×50= 40×60= 90×70 = 12×40 = 70×60= 12×50= 80×70=
40×40=
12×30=
60×300 =
30×80 = 50×50=
11×40=
43×20 =
80×60 =
500×30=
32×200=
601
×
18×30= 11×60 = 800×20 = 30×15=
16×30= 70×70 = 33×30 = 80×80=
11×44= 70×5 = 80×4 = 30×50=
18 × 88 = 44 × 55 = 31 × 60 = 79 × 26 =
23 × 55 = 22 × 14 = 73 × = 97 × 75 = 93 × 14 = 91 × 69 = 67 × 37 = 35 × 35 = 88 × 67 =
61 × 55 =
25 × 31 =
17 × 15 = 2
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