1.下列算式不能先算加法的是( )
| A. | 3×6+42 | B. | (42+12)×6 | C. | 30+52-48 |
20.28-(14-7)的运算结果是( )
| A. | 7 | B. | 28 | C. | 21 |
19.在下面计算不正确的是( )
| A. | 24+12÷4 =36÷4 =9 | B. | 95-17-13 =78-13 =65 | ||
| C. | 4×5-14 =20-14 =6 |
18.67-9×3=8×( )
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| A. | 5 | B. | 6 | C. | 7 |