题目内容
下面计算正确的是( )
| A.78+102=78+100+2 |
| B.78×102=78×100×2 |
| C.624-(124-78)=624-124-78 |
| D.175÷35=175÷5×7 |
A,78+102=180;
78+100+2,
=178+2,
=180;
180=180,本选项正确;
B,78×102=7956;
78×100×2,
=7800×2,
=15600;
7956<15600,本选项错误;
C,624-(124-78),
=624-46,
=578;
624-124-78,
=500-78,
=428;
578>428,本选项错误.
D,175÷35=5,
175÷5×7,
=35×7,
=245;
5<245,本选项错误.
故选:A.
78+100+2,
=178+2,
=180;
180=180,本选项正确;
B,78×102=7956;
78×100×2,
=7800×2,
=15600;
7956<15600,本选项错误;
C,624-(124-78),
=624-46,
=578;
624-124-78,
=500-78,
=428;
578>428,本选项错误.
D,175÷35=5,
175÷5×7,
=35×7,
=245;
5<245,本选项错误.
故选:A.
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