9.19竖式计算0.345x0.32 10.07x2.3 5.68x30.6 95X 78.31递等式计算9.73+4.2x0.12 2.5x4.5-7.6 (2.8+1.27)x(31.7-29.9)9.20竖式计算9.2x6.3 4.26x3.18 5.3x20.06 3.61x0.045递等式计算30.2x8.1-8.1 (1.43-0.6)x6.2 0.25x(1.4+7.7)9.21竖式计算30.2x11.3 0.082x3.14 3.11x5.3 40.105x0.26递等式计算7.06x4.04x3 98.5x(9-8.64) (1.93+2.17)+(31.7-36.6)