1)243×88+243×212
2)47×34+34×26-71×34

1) 243 * 88 + 243 * 212 = 243(88 + 212) = 243 * 300 = 72 900

2) 47 * 34 + 34 * 26 - 71 * 34 = 34(47+26-71) = 34 * 2 = 68