(178±80)÷142—99) = = =
(178±80)÷142—99) = = =
101²+99²=(?)²+?
240÷()=160÷()=560÷()=()÷8=40×()=80÷()=()×20
(-3)²×(-1.2²)÷(-0.3)³=?
99²+101²=?(简便计算)
(100²-99²)+﹙98²-97²﹚+...(2-1)²=
用简便算法计算 99÷(99+1)÷(99+2)×(99-3)……(99+101)=?
0.45=()÷40=(——)=()折=()%=27:()
( )÷16=(— )分数=0.375=9:( )=( )%
1.()÷8=()—()=15:()=0.75=():12=()%
120×2÷(80-60),=240÷20,=12(分钟);(
(—0.4)÷0.02×(—5)=