五年级小数简便计算35·6×0·8+3·56×12=多少

35·6×0·8+3·56×12
=3.56×8+3.56×12
=3.56×(8+12)
=3.56×20
后面自己算就可以了

35.6*0.8+3.56*12
=3.56*8+3.56*12
=3.56*(8+12)
=3.56*20
=71.2

35.6×0.8+3.56×12
=3.56×10×0.8+3.56×12
=3.56×8+3.56×12
=3.56×（12+8)
=3.56×20
=71.2

28.48+42.72=71.2

先乘除,后加减
35.6乘以0.8 = 28.48
3.56乘以12 = 42.72
28.48 + 42.72 = 71.2
所以 35·6×0·8+3·56×12 = 71.2

3.56乘以（8+12）=3.56乘以20=71.2