ГДЗ по математике 5 класс Ткачева ФГОС рабочая тетрадь Часть 1, 2 Часть 1 | Страница 20

\[Страница\ 20.\]

\[\boxed{\mathbf{4}.}\]

\[\textbf{а)}\ 3 + 2\]

\[\textbf{б)}\ 0 + 4\]

\[\textbf{в)}\ 5 + 0\]

\[\boxed{\mathbf{5}.}\]

\[\textbf{а)}\ 3 + 497 = 497 + 3 = 500\]

\[\textbf{б)}\ 5 + 2038 = 2038 + 5 = 2043\]

\[\boxed{\mathbf{6}.}\]

\[\textbf{а)}\ (184 + 239) + 61 = 184 +\]

\[+ (239 + 61) = 184 + 300 = 484\]

\[\textbf{б)}\ (500 + 342) + 158 = 500 +\]

\[+ (342 + 158) = 500 + 500 =\]

\[= 1000\]

\[\textbf{в)}\ 584 + (116 + 258) =\]

\[= (584 + 116) + 258 =\]

\[= 700 + 258 = 958\]

\[\textbf{г)}\ 726 + (274 + 318) =\]

\[= (726 + 274) + 318 =\]

\[= 1000 + 318 = 1318\]

\[\boxed{\mathbf{7}.}\]

\[\textbf{а)}\ 37 + 206 + 163 =\]

\[= (37 + 163) + 206 =\]

\[= 200 + 206 = 406\]

\[\textbf{б)}\ 621 + 257 + 143 + 79 =\]

\[= (621 + 79) + (257 + 143) =\]

\[= 700 + 400 = 1100\]

\[\boxed{\mathbf{8}.}\]

\[\textbf{а)}\ 90\ 046 = 9 \cdot 10\ 000 +\]

\[+ 4 \cdot 10 + 6 \cdot 1\]

\[\textbf{б)}\ 3\ 007\ 200 = 3 \cdot 1\ 000\ 000 +\]

\[+ 7 \cdot 1000 + 2 \cdot 100\]

\[\textbf{в)}\ 40\ 060\ 030 = 4 \cdot 10\ 000\ 000 +\]

\[+ 6 \cdot 10\ 000 + 3 \cdot 10\]

\[\textbf{г)}\ 5\ 700\ 800\ 000 =\]

\[= 5 \cdot 1\ 000\ 000\ 000 +\]

\[+ 7 \cdot 100\ 000\ 000 + 8 \cdot 100\ 000\]