下面的简便运算怎么算啊,

问题描述:

下面的简便运算怎么算啊,
64x15+64x25 4243-854-146 6300 ÷25÷4 3 .8x9.9+3.8x0.1 7 /16x10+7/16x6 (2/3+7/5-2/1)÷42/1

64x15+64x25 =64×(15+25)=64×40=2560 4243-854-146=4243-(854+146)=4243-1000=3243 6300 ÷25÷4 3 .8x9.9+3.8x0.1 =3.8×(9.9+0.1)=3.8×10=38 7 /16x10+7/16x6 =7/16×(10+6)=7/16×16=7 (2/3+7/5-2/1)...