请大将帮我计算下面的计算题,运用乘法运算律,递等式的,752×1.25+4.45×12.5+0.035×125====0.42×160+36×1.6-31×3.2====1.625+2.625+3.625+…+79.625+80.625====

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,
752×1.25+4.45×12.5+0.035×125
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0.42×160+36×1.6-31×3.2
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1.625+2.625+3.625+…+79.625+80.625
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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