列综合算式并计算．（1）比420少56的数的4倍是多少？（2）52与48的和除以4与25的积，商是多少．
直接写出得数．﹣= ÷= 2﹣= 6÷1%=1﹣7÷9= ÷= 24×0.5= 1÷=（+）×0= 2×17=
直接写出得数÷= ÷3= 6×= ﹣=7÷= += ×7= ÷=
口算．÷2= ﹣= ÷= 20%+3=20÷20%= 2×4÷2×4= 12×0×60%= 289÷57≈
口算．﹣= ÷= ÷7= ×=1﹣40%= 1÷37.5%= 2.1×= 82=×4÷×4= 20×（+）= 9.9×99+9.9= π+π=
直接写出复数．+0.125= 4×÷4×= ﹣= 0.1×10÷0.1×10= 2.5×40=﹣×= 36：0.8= 8.9×11﹣8.9= ÷= 10÷0.1×10=
﹣
= 
÷
= 6÷1%=
÷
= 24×0.5= 1÷
=
+
×17=
÷
= 
÷3= 6×
= 
﹣
=
= 
+
= 
×7= 
÷
=
÷2= 
﹣
= 
÷
= 20%+3=
﹣
= 
÷
= 
÷7= 
=
= 82=
×4÷
+
）= 9.9×99+9.9= 
π=
+0.125= 4×
÷4×
﹣
= 0.1×10÷0.1×10= 2.5×40=
﹣
×
÷
= 10÷0.1×10=
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