Question

七点43×2点85+7点15×6点14+7点5×1点二九有简便计算吗？

Answer 1

解：
七点43×2点85+7点15×6点14+7点5×1点二九
=21.1755+43.901+9.675
=74.7515
没有哦 直接计算吧

Answer 2

解: 依据题意有,
4.09*2.5+7.83
=(4+0.09)(2+0.5)+7.83
=8+2+0.18+0.045+7.83
=10+8.01+0.045
=10+8.055
=18.055