1樓:雪中送炭新野
脫式計算
14.35×5/8+62.5%×62.5%+5×5/8=(14.35+62.5%+5)×5/8
=19.975×5/8
=12.484375
4/15×8/11×(45×22)
=(4/15×45)×(8/11×22)
=12×16
=192
1/2+1/6+1/12+...+1/90=1-1/2+1/2-1/3+1/3-1/4+……+1/9-1/10=1-1/10
=9/10
48/5-13/6+17/5-23/6
=(48/5+17/5)-(13/6+23/9)=13-4
=950×10.2-283.5÷27+50.05=510-10.5+50.05
=499.5+50.05
=549.55
117÷36-3.56×0.45
=3.25-1.602
=1.648
1.26×7+1.35×3+1.26×3
=1.26×(7+3)+4.05
=1.26×10+4.05
=12.6+4.05
=16.65
3÷3/8-3/8÷3
=8-1/8
=7又7/8
2樓:匿名使用者
14.35×5/8+62.5%×62.5%+5×5/8=(14.35+62.5%+5)×5/8
=19.975×5/8
=12.484375
4/15×8/11×(45×22)
=(4/15×45)×(8/11×22)
=12×16
=192
1/2+1/6+1/12+...+1/90=1-1/2+1/2-1/3+1/3-1/4+……+1/9-1/10=1-1/10
=9/10
48/5-13/6+17/5-23/6
=(48/5+17/5)-(13/6+23/9)=13-4
=950×10.2-283.5÷27+50.05=510-10.5+50.05
=499.5+50.05
=549.55
117÷36-3.56×0.45
=3.25-1.602
=1.648
1.26×7+1.35×3+1.26×3
=1.26×(7+3)+4.05
=1.26×10+4.05
=12.6+4.05
=16.65
3÷3/8-3/8÷3
=8-1/8
=7又7/8
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