用简便方法计算.
|
(1)6.3+8.7+8.7×3.7,
=(6.3+8.7)+8.7×3.7,
=15+32.19,
=47.19;
(2)1.5×8.4+3×0.3+15×10%,
=1.5×8.4+0.9+1.5×1,
=1.5×(8.4+1)+0.9,
=1.5×9.4+0.9,
=1.5×(10-0.6)+0.9,
=15-0.9+0.9,
=15.
用简便方法计算.
|
(1)6.3+8.7+8.7×3.7,
=(6.3+8.7)+8.7×3.7,
=15+32.19,
=47.19;
(2)1.5×8.4+3×0.3+15×10%,
=1.5×8.4+0.9+1.5×1,
=1.5×(8.4+1)+0.9,
=1.5×9.4+0.9,
=1.5×(10-0.6)+0.9,
=15-0.9+0.9,
=15.