10.若关于x的方程4m-3x=1的解是-1,则m的值为( )
| A. | -2 | B. | -$\frac{1}{2}$ | C. | -1 | D. | 1 |
9.下列各式中,运算正确的是( )
| A. | 3a-2a=1 | B. | a2+a2=a4 | C. | -3ab+2ab=-ab | D. | 2x+3y=5xy |
6.计算:
(1)(-15)-18÷(-3)+|-5|;
(2)$-{2^3}÷\frac{4}{9}×{({-\frac{2}{3}})^2}-({-1.8})-4×({-\frac{1}{5}})$.
(1)(-15)-18÷(-3)+|-5|;
(2)$-{2^3}÷\frac{4}{9}×{({-\frac{2}{3}})^2}-({-1.8})-4×({-\frac{1}{5}})$.
2.根据下列条件,得不到平行四边形的是( )
| A. | AB=CD,AD=BC | B. | AB∥CD,AB=CD | C. | AB=CD,AD∥BC | D. | AB∥CD,AD∥BC |
1.已知a>1,点A(a-1,y1),B(a,y2),C(a+1,y3)都在二次函数y=-$\frac{1}{2}$x2的图象上,则( )
0 308486 308494 308500 308504 308510 308512 308516 308522 308524 308530 308536 308540 308542 308546 308552 308554 308560 308564 308566 308570 308572 308576 308578 308580 308581 308582 308584 308585 308586 308588 308590 308594 308596 308600 308602 308606 308612 308614 308620 308624 308626 308630 308636 308642 308644 308650 308654 308656 308662 308666 308672 308680 366461
| A. | y1<y2<y3 | B. | y1<y3<y2 | C. | y3<y2<y1 | D. | y2<y1<y3 |