脱式计算(能简算要简算) (1)(66-32×1.2)÷0.25 (2)10× 3 4 +17×75%-7×0.75
脱式计算(能简算要简算)(1)(66-32×1.2)÷0.25(2)10×34+17×75%-7×0.75(3)0.25×(515(3-2.5×78))(4)9.99×2...
脱式计算(能简算要简算) (1)(66-32×1.2)÷0.25 (2)10× 3 4 +17×75%-7×0.75 (3)0.25×(5 1 5 (3-2.5× 7 8 )) (4)9.99×22.2+33.3×3.34.
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(1)(66-32×1.2)÷0.25, =(66-38.4)÷0.25, =27.6÷0.25, =110.4, (2)10×
=10×0.75+17×0.75-7×0.75, =(10+17-7)×0.75, =20×0.75, =15, (3)0.25×[5
=0.25×[5
=0.25×[5
=
=1
(4)9.99×22.2+33.3×3.34, =9.99×11.1×2+11.1×3×3.34, =11.1×(9.99×2+3×3.34), =11.1×(19.98+10.02), =11.1×30, =333. |
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