Question

me明天就要入学考试了,但是还有一些数学简算不会做!谁在线帮我解一下,要过程的,今天之内!过时不候!谢谢!

(X=乘,不等于未知数)
①.13/14+13/15+1/14-2/15

②.9.81X0.1+0.5X98.1+0.049X981

③.(3/4-1/3)÷(1-1/3X3/4)

④.0.5X2.5X96X0.125

⑤.5.04X6.5-2.76

⑥.4.82-5.2÷0.8X0.6

⑦.76X(1/23-1/53)+23X(1/53+1/76)-53X(1/23-1/76)

八.999.3-998.2+997.3-996.2+……+3.3-2.2+1.3-0.2

真的谢谢了！要过程，如果有不会也可以先不全写，会一个算一个，但是要正确！如果有全会的当然好！谢谢了！20分！！！

Answer 1

啊嘛嘛，下面各位网友讲的很详细！！！！！！！！！！！

Answer 2

①13/14+13/15+1/14-2/15
=13/14+1/14+13/15-2/15（交换下位置）
=1+11/15
=27/15
②.9.81X0.1+0.5X98.1+0.049X981
=9.81X0.1+5X9.81+4.9X9.81
=9.81×（0.1+5+4.9)（提公因式）
=98.1
③.(3/4-1/3)÷(1-1/3X3/4)（直接算吧= =主要是我懒....）
=5/12÷3/4
=20/3
④.0.5X2.5X96X0.125
=0.5×2.5×8×3×4×0.125（将96分解为8×4×3）
=（2.5×4）×（0.125×8）×（0.5×3）
=15

⑤.5.04X6.5-2.76（硬算可以的....主要还是我懒....）
⑥.4.82-5.2÷0.8X0.6
=4.82-5.2X0.6÷0.8
=4.82-3.9
=0.92
⑦.76X(1/23-1/53)+23X(1/53+1/76)-53X(1/23-1/76)
=76X1/23-76X1/53+23X1/53+23X1/76-53X1/23+53×1/76
=1/53（23-76）+1/23（76-53）+1/76（23+53）
=－1+1+1
=1
八.999.3-998.2+997.3-996.2+……+3.3-2.2+1.3-0.2
看规律，每2个数的差为1.1，共有500组数据
结果就是 1.1*500=550
打字很辛苦的....希望能帮到你~

Answer 3

①.13/14+13/15+1/14-2/15=13/14+1/14+13/15-2/15=1+11/15=26/15
②.9.81X0.1+0.5X98.1+0.049X981=0.981+49.05+48.069=97.929
③.(3/4-1/3)÷(1-1/3X3/4)=（3/4-1/3)÷3/4=（3/4-1/3)*4/3=1-4/9=5/9
④.0.5X2.5X96X0.125=14.875
⑤.5.04X6.5-2.76=32.76-2.76=30
⑥.4.82-5.2÷0.8X0.6=4.82-3.9=0.92
⑦.76X(1/23-1/53)+23X(1/53+1/76)-53X(1/23-1/76)=76/23-76/53+23/53+23/76-53/23+53/76=1-1+1=1

Answer 4

①.13/14+13/15+1/14-2/15=13/14+1/14+13/15-2/15=1+11/15=26/15
②.9.81X0.1+0.5X98.1+0.049X981=0.981+49.05+48.069=97.929
③.(3/4-1/3)÷(1-1/3X3/4)=（3/4-1/3)÷3/4=（3/4-1/3)*4/3=1-4/9=5/9
④.0.5X2.5X96X0.125=14.875
⑤.5.04X6.5-2.76=32.76-2.76=30
⑥.4.82-5.2÷0.8X0.6=4.82-3.9=0.92
⑦.76X(1/23-1/53)+23X(1/53+1/76)-53X(1/23-1/76)=76/23-76/53+23/53+23/76-53/23+53/76=1-1=1
望楼主采纳！