题目内容
| 用递等式计算. 215×2-312 | 196+48×3 |
| 56×(42-37) | 35×8+43×5. |
(1)215×2-312,
=430-312,
=118;
(2)196+48×3,
=196+144,
=340;
(3)56×(42-37),
=56×5,
=280;
(4)35×8+43×5,
=280+215,
=495.
=430-312,
=118;
(2)196+48×3,
=196+144,
=340;
(3)56×(42-37),
=56×5,
=280;
(4)35×8+43×5,
=280+215,
=495.
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