几道简便计算题(1)9.81X0.1+0.5X98.1+0.049X981=(2)7.8÷[(9-8.98)X2.5} = 需要简便计算 求求 大家了 要快

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几道简便计算题(1)9.81X0.1+0.5X98.1+0.049X981=(2)7.8÷[(9-8.98)X2.5}=需要简便计算求求大家了要快几道简便计算题(1)9.81X0.1+0.5X98.1

几道简便计算题(1)9.81X0.1+0.5X98.1+0.049X981=(2)7.8÷[(9-8.98)X2.5} = 需要简便计算 求求 大家了 要快
几道简便计算题
(1)9.81X0.1+0.5X98.1+0.049X981
=
(2)7.8÷[(9-8.98)X2.5}
=

需要简便计算 求求 大家了 要快

几道简便计算题(1)9.81X0.1+0.5X98.1+0.049X981=(2)7.8÷[(9-8.98)X2.5} = 需要简便计算 求求 大家了 要快
(1)9.81X0.1+0.5X98.1+0.049X981
=9.81x0.1+5x9.81+4.9x9.81(此处简算)
=9.81x(0.1+5+4.9)
=9.81x10
=98.1
(2)7.8÷[(9-8.98)X2.5}
=7.8÷(0.02x2.5)
=7.8÷0.05
=7.8x20 (此处简算÷0.05,即÷1/20,即x20)
=156

9.81X0.1+0.5X98.1+0.049X981
=9.81X0.1+9.81x5+9.81x4.9
=9.81x(0.1+5+4.9)
=9.81x10
=98.1
7.8÷[(9-8.98)X2.5}
=7.8÷(0.02x2.5)
=7.8÷0.05
=7.8÷1/20
=7.8x20
=156

=9.81X0.1+0.5X9.81X10+9.81X100X0.049
=9.81X0.1+9.81X5+9.81X4.9
=9.81X(0.1+5+4.9)
=9.81X10
=98.1
=7.8÷(0.02X2.5)
=7.8÷(2x2.5x0.01)
=7.8÷(5x0.01)
=7.8÷5x100
=7.8x100÷5
=7.8x20
=18x2=156

(1)=98.1×0.01+0.5×98.1+0. 49×98.1 =98.1×(0.01+0.5+0.49) =98.1 (2)=7.8÷[0.02×2.5] =7.8÷0.05 =156

直接用手机计算器算应该就出来了。