Question

请大将帮我计算下面的计算题,运用乘法运算律,递等式的,

Answer 1

752×1.25+4.45×12.5+0.035×125

=(7.52+0.445+0.035)x125

=8x125

=1000

0.42×160+36×1.6-31×3.2

=(42+36-62)x1.6

=16x1.6

=25.6

1.625+2.625+3.625+…+79.625+80.625

=(1+79)+(2+78)+(3+77)+...+80+(0.625x80)

=3200+50

=3250