口算.(近似值符号的是估算题)
0.105×100= 1993+1994= 603×39≈ 4950÷51= 112﹣102=
16×0.25= 19÷9﹣10÷9= ﹣= 8π≈ 2.63+3.7=
1﹣+= 7×8×(+)= 1﹣÷= ÷×0=
计算,能简算的要写出简算过程.
①4×0.8×2.5×12.5
②0.65×14+87×65%﹣65%
③42÷[14﹣(50﹣39)]
④2.25×4.8+77.5×0.48.
计算下列各题:
(1)1.8×(4.7﹣3.87÷0.9)=
(2)×8.5+×8.5=
(3)9.72×1.6﹣18.305÷7=
(4)5.97+3.8×7.2﹣24.6=
脱式计算(能箭算的要箭算)
6.5×8+3.5×8﹣44 138×99 (999+111)÷[56×(﹣)]
(1.9+1.9+1.9+1.9)×2.5 [2﹣(11.9﹣8.4×1)]÷1.3.
试题篮
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