计算下列各题,能简算的要简算. 25.74-3.57-6.43 2.8×3.6+1.4×2.8 (0...
计算下列各题,能简算的要简算.25.74-3.57-6.432.8×3.6+1.4×2.8(0.4+40)×2.578.7-17.7×3.6567÷20÷518÷0.3×...
计算下列各题,能简算的要简算. 25.74-3.57-6.43 2.8×3.6+1.4×2.8 (0.4+40)×2.5 78.7-17.7×3.6 567÷20÷5 18÷0.3×(8-6.5)
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①25.74-3.57-6.43
=25.74-(3.57+6.43)
=25.74-10
=15.74
②2.8×3.6+1.4×2.8
=2.8×(3.6+1.4)
=2.8×5
=14
③(0.4+40)×2.5
=2.5×0.4+40×2.5
=1+100
=101
④78.7-17.7×3.6
=78.7-63.72
=14.98
⑤567÷20÷5
=567÷(20×5)
=567÷100
=5.67
⑥18÷0.3×(8-6.5)
=60×1.5
=6×10×1.5
=6×15
=90
=25.74-(3.57+6.43)
=25.74-10
=15.74
②2.8×3.6+1.4×2.8
=2.8×(3.6+1.4)
=2.8×5
=14
③(0.4+40)×2.5
=2.5×0.4+40×2.5
=1+100
=101
④78.7-17.7×3.6
=78.7-63.72
=14.98
⑤567÷20÷5
=567÷(20×5)
=567÷100
=5.67
⑥18÷0.3×(8-6.5)
=60×1.5
=6×10×1.5
=6×15
=90
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