可以运用乘法分配律,即为(1.2+80)×2.5=(1+0.2+80)×2.5=2.5+2.5×0.2+2.5×80=2.5+0.5+200=203
1.2x2.5+8x25
=0.12*25+8*25
(8+0.12)*25
8.12*25
203
回答:
1.2×2.5+8×25
=0.3×4×2.5+200
=0.3×10+200
=3+200
=203
运用了亲情数4×25=100
12x25+8x25
=12*25+8*25
=(8+12)*25
=20*25
=500
X(8X25)=0.5X200 =100