Question

计算：7.816×1.45+3.14×2.184+1.69×7.816=( )。A.78.16B.314C.31.4D.21.6

A.816×1.45+3.14×2.184+1.69×7.816=(
B.78.16
B.314
C.31.4
D.21.6

Answer 1

【答案】：C
解析：原式=7.816×1.45+3.14×(10-7.816)+1.69×7.816
=7.816×1.45+3.14×10-3.14×7.816+1.69×7.816
=7.816×(1.45-3.14+1.69)+3.14×10
=7.816×0+3.14×10
=31.4
由此可知本题正确答案为C。