Вычисли удобным способом: 374 - (200+74) = 743 - (500+20) = 313 - (107+206) = 635 - (80+135) = 426 - (326+10) = 529 - (64+136) = 681 - (81+130) = 377 - (37+140) = 295 - (157+43) = Найди неизвестное: 485+Х=700 317-Х=283 Х-148=359 Х+250=867 632-Х=247 Х-465=175

Вычислим:

374 - (200 + 74) = 374 - 200 - 74 = 300 - 200 = 100;

743 - (500 + 20) = 743 - 500 - 20 = 243 - 20 = 223;

313 - (107 + 206) = 313 - 313 = 0;

635 - (80 + 135) = 635 - 80 - 135 = 500 - 80 = 420;

426 - (326 + 10) = 426 - 326 - 10 = 100 - 10 = 90;

529 - (64 + 136) = 529 - 200 = 329;

681 - (81 + 130) = 681 - 81 - 130 = 600 - 130 = 470;

377 - (37 + 140) = 377 - 177 = 200;

295 - (157 + 43) = 295 - 200 = 95.

Найдем неизвестную величину:

485 + Х = 700,

Х = 700 - 485,

Х = 215;

317 - Х = 283,

Х = 317 - 283,

Х = 34;

Х - 148 = 359,

Х = 359 + 148,

Х = 507;

Х + 250 = 867,

Х = 867 - 250,

Х = 317;

632 - Х = 247,

Х = 632 - 247,

Х = 385;

Х - 465 = 175,

Х = 175 + 465,

Х = 640.