55×35+66×35-35的简便运算=（55+66-1）x35=120x35=120x5x7=600x7=4200
55×35+66×35-35=35×（55+66-1）=35×120=35×2×60=70×60=4200
计算：=35*（55+66-1）=35*120=4200
=35*(55+66-1)=4200
