简算:①57.5-14.25-15 3 4 ②102.31×59③( 5 6 ×10.68+8.52× 5 6
简算:①57.5-14.25-1534②102.31×59③(56×10.68+8.52×56)÷135④0.1+0.2+0.3+0.4+…+0.9+0.1+0.11+0...
简算:①57.5-14.25-15 3 4 ②102.31×59③( 5 6 ×10.68+8.52× 5 6 )÷1 3 5 ④0.1+0.2+0.3+0.4+…+0.9+0.1+0.11+0.12+…+0.98+0.99.
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①57.5-14.25-15
=57.5-(14.25+15.75), =57.5-30, =27.5; ②102.31×59 =102.31×(60-1), =102.31×60-102.31×1, =6138.6-102.31, =6036.29; ③(
=[
=
=10; ④0.1+0.2+0.3+0.4+…+0.9+0.1+0.11+0.12+…+0.98+0.99 =(0.1+0.9)×9÷2+(0.1+0.99)×90÷2, =4.5+1.09×45, =4.5+49.05, =53.55. |
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