Вычисли удобным способом.
167 + 324 + 133 + 76;
418 + 165 + 35 + 182;
298 + 187 + 379 + 99;
384 + 199 + 286 + 78.
167 + 324 + 133 + 76 = (167 + 133) + (324 + 76) = 300 + 400 = 700;
418 + 165 + 35 + 182 = (165 + 35) + (418 + 182) = 200 + 600 = 800;
298 + 187 + 379 + 99 = (300 + 200 + 400 + 100) − (2 + 13 + 21 + 1) = (500 + 500) − (15 + 22) = 1000 − 37 = 963;
384 + 199 + 286 + 78 = (400 + 200 + 300 + 100) − (16 + 1 + 14 + 22) = (600 + 400) − (17 + 36) = 1000 − 53 = 947.