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1 # 尤加利gril
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2 # 使用者839661195105436
27X150-198
=27X3X50-200+2
=81X50-50X4+2
=50X(81-4)+2
=50X77+2
=350X11+2
=3850+X
=3852
27X150-198
=27X3X50-200+2
=81X50-50X4+2
=50X(81-4)+2
=50X77+2
=350X11+2
=3850+X
=3852
(1)280×16=4480;
驗算:4480÷280=16
(2)36×242=8712;
驗算:8712÷242=36
(3)420×50=21000;
驗算:21000÷420=50
(4)48×320=15360;
驗算:15360÷320=48
(5)57×198=11286;
驗算:11286÷198=57
(6)406×80=32480.
驗算:32480÷406=80