题目内容
| 脱式计算 4.8+4.2÷60 | 279+141+121 | 25×23×4 |
| 102×88-2×88 | (40+4)×25 | 13.75-5.28-4.72. |
(1)4.8+4.2÷60,
=4.8+0.07,
=4.87;
(2)279+141+121,
=(279+121)+141,
=300+141,
=441;
(3)25×23×4,
=(25×4)×23,
=100×23,
=2300;
(4)102×88-2×88,
=(102-2)×88,
=100×88,
=8800;
(5)(40+4)×25,
=40×25+4×25,
=1000+100,
=1100;
(6)13.75-5.28-4.72,
=13.75-(5.28+4.72),
=13.75-10,
=3.75.
=4.8+0.07,
=4.87;
(2)279+141+121,
=(279+121)+141,
=300+141,
=441;
(3)25×23×4,
=(25×4)×23,
=100×23,
=2300;
(4)102×88-2×88,
=(102-2)×88,
=100×88,
=8800;
(5)(40+4)×25,
=40×25+4×25,
=1000+100,
=1100;
(6)13.75-5.28-4.72,
=13.75-(5.28+4.72),
=13.75-10,
=3.75.
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