[1–(+)]÷ –×÷3
–(+) ×–
25÷(–) +–
(–)÷(+) [1–(+)]÷3.5
[(1–)×]÷4 ++
(1–×)÷ [(1–)×]÷4
×+÷
12×103-4500÷75 ×[÷(×)]
(+)×15×11 37.5+19.5÷(2.5×4)
(×+)÷ ÷[(+)×]
2881÷43=(1290+1591)÷434=1290÷43+1591÷43=30+37=67( )
14.8×6.3-6.3×6.5+8.3×3.7 =(14.8-6.5)×6.3+8.3×3.7="8.3×6.3+8.3×3.7" 8.3×(6.3+3.7) =8.3×10=83( )
(1÷1-1)÷5.1=(1-1)÷5.1 =0÷5.1=0( )
18.1+(3-0.299÷0.23)×1=18.1+1.6×1=18.1+1.6 =19.7( )
(80-9.8)×-1.32=70.2×-1.32=28.08-1.32=26.76( )
45.55-(6.82+15.55) 34.52-17.87-12.23
2.5×(1.92÷0.3-5.9) 24.5-(7.58+)
7.5-2.45+7.5+2.45 (-)×21+
5.09-(0.09+1.23) 9.36-(4.36-3.5)
14.8×6.3-6.3×6.5+8.3×3.7 18.1+(3-0.299÷0.23)×1
()÷ 20-[(
19175÷59+678 36.5×1.4-8.51
1.3-3.79+9.7-6.21 8×0.4×12.5×2.5
125×(8+0.8+0.08) 45÷〔78-(25+38)
3.35×6.4×2+6.7×3.6 18.7-3.375-6.625
2.5×4.4 25×1.25×32
(3.75+4.1+2.35)×9.8 1.28+9.8+7.72+10.2