计算下面各题,能简便运算的要简笔运算.
来源:学生作业帮 编辑:神马作文网作业帮 分类:数学作业 时间:2024/11/12 19:20:48
计算下面各题,能简便运算的要简笔运算.
467+298 16.8-5.1-4.9 (9/13)÷8-(1/8)×(1/13)
14.2×99+14.2 ((1/4)+(5/6)-(1/3))×12 (3/5)×(2/5)÷(3/5)×(2/5)
467+298 16.8-5.1-4.9 (9/13)÷8-(1/8)×(1/13)
14.2×99+14.2 ((1/4)+(5/6)-(1/3))×12 (3/5)×(2/5)÷(3/5)×(2/5)
①467+298=467+300-2=767-2=765
②16.8-5.1-4.9=16.8-(5.1+4.9)=16.8-10=6.8
③(9/13)÷8-(1/8)×(1/13)=9/13*1/8-1/8*1/13=1/8*(9/13-1/13)=1/8*8/13=1/13
④14.2*99+14.2=14.2*99+14.2*1=14.2*(99+1)=14.2*100=1420
⑤((1/4)+(5/6)-(1/3))×12 =1/4*12+5/6*12-1/3*12=3+10-4=9
⑥(3/5)×(2/5)÷(3/5)×(2/5)=(3/5*2/5)/(3/5*2/5)=1
希望对你有所帮助..
②16.8-5.1-4.9=16.8-(5.1+4.9)=16.8-10=6.8
③(9/13)÷8-(1/8)×(1/13)=9/13*1/8-1/8*1/13=1/8*(9/13-1/13)=1/8*8/13=1/13
④14.2*99+14.2=14.2*99+14.2*1=14.2*(99+1)=14.2*100=1420
⑤((1/4)+(5/6)-(1/3))×12 =1/4*12+5/6*12-1/3*12=3+10-4=9
⑥(3/5)×(2/5)÷(3/5)×(2/5)=(3/5*2/5)/(3/5*2/5)=1
希望对你有所帮助..