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脱式计算(能简算的要简算):(1)3.5×0.8+7.5×0....

(1)3.5×0.8+7.5×0.8-80%,=(3.5+7.5-1)×0.8,=10×0.8,=8;(2) 1 5 ÷3+ 4 5 × 1 3 ,=( 1 5 + 4 5 )× 1 3 ,=1× 1 3 ,= 1 3 ;(3)20-(3.84+1.21)×0.4,=20-5.05×0.4,=20-2.02,=17.98;(4)35÷[( 11 6 - 2 3 )×6].=35÷[ 7 6 ...

1.46×5+12.8÷0.4×7.5 =1.46×5+3.2×7.5 =1.46x5+3.2x1.5x5 =1.46x5+4.8x5 =(1.46+4.8)x5 =6.26x5 =31.3 希望帮到你 望采纳 谢谢 加油

7.5-7.5×0.8 =7.5×(1-0.8) =7.5×0.2 =1.5

7.5×4/5+1.5×0.8+0.8 =7.5×0.8+1.5×0.8+0.8 =0.8×(7.5+1.5+1) =0.8×10 =8

0.84除1.2 +0.8乘7.5 =0.7+6 =6.7

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