一定要拆数,1.3又5分之3×25又5分之2+37.5×6又5分之22.6.8×16.8+19.3×3.23.139×138分之137+137×138分之14.4.4×57.8+45.3×5.65.41.2×8.1+11×9又4分之1+53.7×1.96.41又3分之1×4分之3+51又4分之1×5分之4+61又5分之1×6分

Question

一定要拆数,
1.3又5分之3×25又5分之2+37.5×6又5分之2
2.6.8×16.8+19.3×3.2
3.139×138分之137+137×138分之1
4.4.4×57.8+45.3×5.6
5.41.2×8.1+11×9又4分之1+53.7×1.9
6.41又3分之1×4分之3+51又4分之1×5分之4+61又5分之1×6分之5

Answer 1

1.3又5分之3×25又5分之2+37.5×6又5分之2
=3.6×25+3.6×2/5+37.5×6+37.5×2/5
=90+225+（3.6+37.5）×2/5
=315+41.1×0.4
=315+16.44
=331.44
2.6.8×16.8+19.3×3.2
=6.8×16.8+16.8×3.2+2.5×3.2
=（6.8+3.2）×16.8+8
=10×16.8+8
=168+8
=176
3.139×138分之137+137×138分之1
=（139+1）×137/138
=140×137/138
=（138+2）×137/138）
=137+137/69
=138又68/69
4.4.4×57.8+45.3×5.6
=4.4×45.3+4.4×12.5+45.3×5.6
=（4.4+5.6）×45.3+55
=10×45.3+55
=453+55
=508
5.41.2×8.1+11×9又4分之1+53.7×1.9
=41.2×8.1+11×9又1/4+41.2×1.9+12.5×1.9
=41.2×（8.1+1.9）+101.75+23.75
=41.2×10+125.5
=412+125.5
=537.5
6.41又3分之1×4分之3+51又4分之1×5分之4+61又5分之1×6分之5
=（40+4/3）×3/4+（50+5/4）×4/5+（60+6/5)×5/6
=40×3/4+4/3×3/4+50×4/5+5/4×4/5+60×5/6+6/5×5/6
=30+1+40+1+50+1
=123