Упр.97 Часть 1 ГДЗ Рабочая тетрадь Истомина 4 класс (Математика)

а)

$$3655 : 17 = 215$$
$$215 \cdot 170 = 215 \cdot 17 \cdot 10 = 3655 \cdot 10 = 36550$$
$$2150 : 17 = 215 \cdot 17 \cdot 10 = 3655 \cdot 10 = 36550$$
$$3655 : 215 = 17$$
$$215 \cdot 17 = 3655$$
$$36550 : 17 = 3655 : 17 \cdot 10 = 215 \cdot 10 = 2150$$

б)

$$144 \cdot 79 = 11376$$
$$144 \cdot 790 = 144 \cdot 79 \cdot 10 = 11376 \cdot 10 = 113760$$
$$11376 : 144 = 79$$
$$1400 \cdot 79 = 110600$$
$$11376 : 79 = 144$$
$$11376 : 144 = 79$$

в)

$$20956 : 26 = 806$$
$$806 \cdot 260 = 806 \cdot 26 \cdot 10 = 20956 \cdot 10 = 209560$$
$$20956 : 806 = 26$$
$$806 \cdot 260 = 806 \cdot 26 \cdot 10 = 20956 \cdot 10 = 209560$$
$$26 \cdot 806 = 20956$$
$$209560 : 26 = 20956 : 26 \cdot 10 = 806 \cdot 10 = 8060$$

г)

$$583 \cdot 9 = 5247$$
$$583 \cdot 90 = 583 \cdot 9 \cdot 10 = 5247 \cdot 10 = 52470$$
$$52470 : 583 = 5247 : 583 \cdot 10 = 9 \cdot 10 = 90$$
$$5830 : 5247 = 583$$
$$5247 : 9 = 583$$
$$583 \cdot 8 + 583 = 583 \cdot (8+1) = 583 \cdot 9 = 5247$$

Ответ

а) $$3655 : 17 = 215$$, $$215 \cdot 170 = 36550$$, $$2150 : 17 = 36550$$, $$3655 : 215 = 17$$, $$36550 : 17 = 2150$$.

б) $$144 \cdot 79 = 11376$$, $$144 \cdot 790 = 113760$$, $$11376 : 144 = 79$$, $$1400 \cdot 79 = 110600$$, $$11376 : 79 = 144$$, $$11376 : 144 = 79$$.

в) $$20956 : 26 = 806$$, $$806 \cdot 260 = 209560$$, $$20956 : 806 = 26$$, $$806 \cdot 260 = 209560$$, $$26 \cdot 806 = 20956$$, $$209560 : 26 = 8060$$.

г) $$583 \cdot 9 = 5247$$, $$583 \cdot 90 = 52470$$, $$52470 : 583 = 90$$, $$5830 : 5247 = 583$$, $$5247 : 9 = 583$$, $$583 \cdot 8 + 583 = 5247$$.