用简便的方法计算9i;`-x8l,l8r1G/O*S:O6N
1.86×7.2-1.86×2.29i;`-x8l,l8r1G/O*S:O6N
算式：提示/l1^,N-Q.},n5q*s(c5}9{'A9i;`-x8l,l8r1G/O*S:O6N
=0y3p+L'j(D5c,^-d*t+\6c4v9i;`-x8l,l8r1G/O*S:O6N