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168÷[(47一43)x2]脱式

原式 =168÷2÷(47-43) =84÷4 =21

60+240÷[(30+10)x2]+62×[(300一145)÷5] =60+240÷(40×2)+62×(155÷5) =60+240÷80+62×31 =60+3+1922 =1985

(1)4.8+4.2÷60, =4.8+0.07, =4.87; (2)279+141+121, =(279+121)+141, =300+141, =441; (3)25×23×4, =(25×4)×23, =100×23, =2300; (4)102×88-2×88, =(102-2)×88, =100×88, =8800; (5)(40+4)×25, =40×25+4×25,...

2.47x0.8÷0.43+3.67 =1.976÷0.43+3.67 ≈4.6+3.67 =8.27

98.5一14.82÷7.6x3.2 =98.5-1.95×3.2 =98.5-6.24 =92.26

=8✘12✘2 =96✘2 =192

280/(4+3*2) =280/(4+6) =280/10 =28 280/[(4+3)*2] =280/[7*2] =280/14 =20

1.5x[1÷(2.1-2.05] =1.5÷【1÷0.05】 =1.5÷20 =0.075

脱式计算 (550 +450)÷(25x2) =1000÷50 =20

96÷(8十4)x2 =96÷12x2 =8x2 =16

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