Question

2.18*325-21.8*15.7+16.8*78.2怎么巧算？

Answer 1

2.18*325-21.8*15.7+16.8*78.2
=2.18*325-2.18*157+16.8*78.2
=2.18*（325-157）+16.8*78.2
=2.18*168+16.8*78.2
=168（2.18+7.82）
=168*10
=1680

Answer 2

2.18*325-21.8*15.7+16.8*78.2怎么巧算？
2.18*325-21.8*15.7+16.8*78.2
=2.18x(325-10x15.7)+16.8x78.2
=2.18x168+168x0.1x78.2
=168x（2.18+7.82）
=168x10
=1680

Answer 3

原式=2.18×325－2.18×157+16.8×78.2
=2.18×(325－157)+16.8×78.2
=2.18×168+168×7.82
=168×(2.18+7.82)
=168×10
=1680