用简便计算55*7+56*7

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用简便计算55*7+56*7用简便计算55*7+56*7用简便计算55*7+56*755X7+56X7=(55+56)X7=111X7=77755*7+56*7=7*(55+56)=7*111=777

用简便计算55*7+56*7
用简便计算55*7+56*7

用简便计算55*7+56*7
55X7 +56 X 7= (55+56)X 7 = 111X7 =777

55*7+56*7
=7*(55+56)
=7*111
=777

50*7+5*7+50*7+6*7=100*7+11*7=777

55*7+56*7
=55*7+45*7+11*7
=(55*7+45*7)+11*7
=100*7+11*7
=700+77
=777