84*17-42*2+21*136的简便运算
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![84*17-42*2+21*136的简便运算](/uploads/image/z/242663-23-3.jpg?t=84%2A17-42%2A2%2B21%2A136%E7%9A%84%E7%AE%80%E4%BE%BF%E8%BF%90%E7%AE%97)
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84*17-42*2+21*136的简便运算
84*17-42*2+21*136的简便运算
84*17-42*2+21*136的简便运算
84*17-42*2+21*136=4*21*17-21*2*2+21*136=21*68-21*4+21*136=(68-4+136)*21=200*21=4200
84*17-42*2+21*136
=84*17-84+21*4*34
=84*17-84+84*34
=84*(17-1+34)
=84*50
=4200
=42*2*17-42*2+21*2*68
=42*34-42*2+42*68
=42*(34-2+68)
=42*100
=4200