①45×23+102
②780-6×25
③25×125×4×8
④37×108-37×8
①28×98+72×98
②5276-276×15
③866-375-25+144
④75+25×120
⑤78÷26+22×26
⑥7245÷(824-789)×90
①1÷0.25-0.25÷1
②6.28÷1.25÷8
③25.2÷[14.2-(7.2+2.8)]
④79-18.9÷0.4
⑤4.8×12-4.8×2
⑥4.82÷0.25+1.25÷0.25
①+++
②(-+)×24
③1.5×+8.5×
④4×0.8×2.5×12.5
⑤25××40%×
⑥÷[(+)×]
①3.6﹣2.8+7.4﹣7.2
②1.25×1.6×25
③÷4
④÷[(﹣)×]