10除以8加3.96乘以12.5%加2.04乘以16分之26000减105乘以3685减84又8分之7除以715分之4除以[(7分之4加21分之4)乘以12分之7]5分之3X加3.4X=7

有一样东西，叫做计算器……

10除以8加3.96乘以12.5%加2.04乘以16分之2
6000减105乘以36
85减84又8分之7除以7
15分之4除以[(7分之4加21分之4)乘以12分之7]
5分之3X加3.4X=7
1.
10÷8+3.96×12.5%+2.04×2/16
=10/8+3.96×8×0.125/8+2.04/8
=(10+3.96+2.04)/8
=16/8
=2
2.
6000-105×36
=6000-3600-5×36
=2400-180
=2220
3.85-(84+7/8)÷7
=85-(84/7+7/8×1/7)
=85-(12+1/8)
=72+7/8
=72又7/8
4.4/15÷[(4/7+4/21)×7/12]
=4/15÷(4/7×7/12+4/21×7/12)
=4/15÷(1/3+1/9)
=4/15×9/4
=3/5
5.
3x/5+3.4x=7
0.6x+3.4x=7
4x=7
x=7/4
ok

1.
10÷8+3.96×12.5%+2.04×2/16
=10/8+3.96×8×0.125/8+2.04/8
=(10+3.96+2.04)/8
=16/8
=2
2.
6000-105×36
=6000-3600-5×36
=2400-180
=2220
3.85-(84+7/8)÷7
=85-(84/7+7/8×1/7)
=85-(12+1/8)
=72+7/8
=72又7/8
4.4/15÷[(4/7+4/21)×7/12]
=4/15÷(4/7×7/12+4/21×7/12)
=4/15÷(1/3+1/9)
=4/15×9/4
=3/5
5.
3x/5+3.4x=7
0.6x+3.4x=7
4x=7
x=7/4

有一种叫做计算器的东西也长在电脑上

10除以8加3.96乘以12.5%加2.04乘以16分之2 =
10/8+3.96*12.5%+2.04*2/16=1/8*(10+3.96+2.04)=16/8=2
6000减105乘以36 =6000-105*36=6*(1000-105*6)
=6*370=2220
85减84又8分之7除以7=85-12又8分之1=72又8分之7
15分之4除以[(7分之4加21分之4)乘以12分之7]=
15分之4除以[(21分之16)乘以12分之7] =
15分之4除以[(9分之4]=5分之3=0.6
5分之3X加3.4X=7. 4X=7. x=7/4