题目内容
递等式计算
| (12.8+13.2)÷5 | 840÷4×6 | 300-15×12 |
| 130+12×27 | 58×21-58 | (67-25)×18. |
(1)(12.8+13.2)÷5,
=26÷5,
=5.2;
(2)840÷4×6,
=210×6,
=1260;
(3)300-15×12,
=300-180,
=120;
(4)130+12×27,
=130+324,
=454;
(5)58×21-58,
=58×(21-1),
=58×20,
=1160;
(6)(67-25)×18,
=42×18,
=756.
=26÷5,
=5.2;
(2)840÷4×6,
=210×6,
=1260;
(3)300-15×12,
=300-180,
=120;
(4)130+12×27,
=130+324,
=454;
(5)58×21-58,
=58×(21-1),
=58×20,
=1160;
(6)(67-25)×18,
=42×18,
=756.
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