0.4*(1.25+2.5)*8巧算

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0.4*(1.25+2.5)*8巧算0.4*(1.25+2.5)*8巧算0.4*(1.25+2.5)*8巧算0.4*(1.25+2.5)*8=0.4×1.25×8+0.4×2.5×8=4+8=120.

0.4*(1.25+2.5)*8巧算
0.4*(1.25+2.5)*8巧算

0.4*(1.25+2.5)*8巧算
0.4*(1.25+2.5)*8
=0.4×1.25×8+0.4×2.5×8
=4+8
=12

0.4*(1.25+2.5)*8
=0.4*(1.25*8)+(0.4*2.5)*8
=0.4*10+1*8
=4+8
=12

0.4*(1.25+2.5)*8
=0.4×1.25×8+0.4×2.5×8
=0.4×10+8
=4+8
=12