(-1/42)÷[1/2-1/3+5/7+(-2/3)^*(-6)]
=-1/42÷[1/6+5/7+4/9*(-6)]
=-1/42÷[37/42-8/3]
=-1/42÷(-25/14)
=1/75.
解2 被除数、除数都乘以42,得
原式=-1÷[21-14+30-112]
=-1÷(51-126)
=1/75.等于15
猜你喜欢
- 1两个连续偶数的平均数是9,这两个偶数分别是_、_.
- 2i want the car to be stopped.i ___the car.1 want to stop 2 want you to stop
- 3I'm not very strong, ______I often exercise. but, so, because, although选哪个?
- 4已知直角三角形任意两边求第三条边(a,b为直角边,c为斜边)a=12,c=20,b=?
- 5填空:I'm afraid the long ones have been sold______?
- 6已知x^2+xy-6y^2=0,且y不等于0 .求:(1)x\y的值(2)x+3y\x-3y的值
- 7《中间位置速度Vs/2=[(Vo^2 +Vt^2)/2]1/2 6.位移S= V平t=Vot + at^2/2=Vt/2t 》,
- 8已知圆的极坐标方程ρ²+4ρcos(θ+π/3)-5=0
- 9一个正方体棱长10厘米装满水后再将水倒入一个高20厘米的圆柱形玻璃杯内刚好装满玻璃杯底面积是多少?
- 10She wants a sweater(对画线部分提问) 画线部分是(a sweater)