计算下面各题,怎样简便就怎样计算.884÷34+17×21 1.25×3.2×0.25 ( 4 5 + 1 4
计算下面各题,怎样简便就怎样计算.884÷34+17×211.25×3.2×0.25(45+14)÷73+3104÷5+39×454.2-1.38+5.8-4.622÷2...
计算下面各题,怎样简便就怎样计算.884÷34+17×21 1.25×3.2×0.25 ( 4 5 + 1 4 )÷ 7 3 + 3 10 4÷5+39× 4 5 4.2-1.38+5.8-4.62 2÷ 2 5 - 2 5 ÷2.
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(1)884÷34+17×21, =26+357, =383; (2)1.25×3.2×0.25, =1.25×(0.8×4)×0.25, =(1.25×0.8)×(4×0.25), =1×1, =1; (3)(
=
=
=
(4)4÷5+39×
=
=
=
=32; (5)4.2-1.38+5.8-4.62, =(4.2+5.8)-(1.38+4.62), =10-6, =4; (6)2÷
=5-
=4
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