—OK! I will.
A:turn on
B:turn off
C:turn up
D:turn down
已知向量a→=1,2,向量b→=x,-2,且a→∥b→,则实数x等于( )
直接写出得数.
560÷8×7=____
99÷8÷0.125=____
698+297=____
0.64÷0.8=____
( 16 + 18)×24=____
15 ﹣ 79 + 45 =____
1÷25%×25=____
6÷ 13 ﹣ 13 ÷6=____