76.1x17-76.1x7+76.1X10 =(76.1×10+76.1×7)-76.1×7+76.1+×10=76.1×10+76.1×10=761+761=1522
原式=76.1×(17-7+10)=76.1×20=761×2=1522
原式=76.1x(17-7+10)=76.1x20=1522
简便计算76.1x17-76.1x7+76.1X10=76.1x(17-7+10)=76.1x20=1522
=76.1×(17-7+10)