x-52-48=x-(+)
ac+bc=(+)×
①25×32×125
②488+137+263+22
③346-132-68
④25×44
⑤88×56+44×88
⑥540÷45
①4.36+1.8+2.64+3.2
②25×102
③856﹣290﹣56
④278×119﹣19×278
⑤(463﹣287)+408÷17
①72+238+28
②125×48
③101×67
④37×46+46×63
⑤938-263-537
26×50= 10−0.86= 25×0.2÷25×0.2=
8÷ = 12×( )= 2.5×3.5×0.4=
①713÷23×28
②8.5×99
③9.6−11÷7+ ×4
④87.58-(7.58-3.8)
⑤1.25×25×3.2
⑥ ×3.5+5.5×80%+1÷1
① x+0.2x =9.5
②2.5:5= :
③0.45×(x−3.7)=9
2.4×5= 0.22×5= 1-0.85= 2.3×4.1+5.7=
22.6-3.4-2.6= 12÷0.01 = 0÷0.42= 2.4a+6a=
0.85+0.25= 0.1×0.1+0.1×0.1=
①415-176-24
②35×102
③8.29+3.7+0.71+6.3
④3600÷25÷4