题目内容
| 脱式计算. 28×(310-150)÷32 | (269+151)÷(145-75) | 150-20×5+25. |
(1)28×(310-150)÷32
=28×160÷32
=4480÷32
=140;
(2)(269+151)÷(145-75)
=420÷70
=6;
(3)150-20×5+25
=150-100+25
=50+25
=75.
=28×160÷32
=4480÷32
=140;
(2)(269+151)÷(145-75)
=420÷70
=6;
(3)150-20×5+25
=150-100+25
=50+25
=75.
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