能简算的简算:1、0.25*1.25*32 2、4.17+5.83*2 3、18.96-3.3*1.2 4、5.3*14.9+5.3*5.1
1个回答
展开全部
1、0.25*1.25*32
=0.25×4×1.25×8
=1×10
=10
2、4.17+5.83*2
=4.17+5.83+5.83
=10+5.83
=15.83
3、18.96-3.3*1.2
=15.8×1.2-3.3×1.2
=(15.8-3.3)×1.2
=12.5×1.2
=12.5×4×0.3
=50×0.3
=15
4、5.3*14.9+5.3*5.1
=5.3×(14.9+5.1)
=5.3×20
=106
=0.25×4×1.25×8
=1×10
=10
2、4.17+5.83*2
=4.17+5.83+5.83
=10+5.83
=15.83
3、18.96-3.3*1.2
=15.8×1.2-3.3×1.2
=(15.8-3.3)×1.2
=12.5×1.2
=12.5×4×0.3
=50×0.3
=15
4、5.3*14.9+5.3*5.1
=5.3×(14.9+5.1)
=5.3×20
=106
追问
还有一道题(最后一道):21*(9.3-2.4)+6.9
追答
21*(9.3-2.4)+6.9
=21*6.9+6.9
=(21+1)*6.9
=22×(7-0.1)
=154-2.2
=151.8
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