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脱式计算,能简便的要用简便计算:(0.48+5.6)÷0.8 1.4×2.5+1.8×2
脱式计算,能简便的要用简便计算:(0.48+5.6)÷0.81.4×2.5+1.8×2.52.5×(0.2÷0.4)-0.1476.8×5+76.8×4+76.8...
脱式计算,能简便的要用简便计算:(0.48+5.6)÷0.8 1.4×2.5+1.8×2.5 2.5×(0.2÷0.4)-0.14 76.8×5+76.8×4+76.8
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(1)(0.48+5.6)÷0.8
=0.48÷0.8+5.6÷0.8
=0.6+7
=7.6;
(2)1.4×2.5+1.8×2.5
=(1.4+1.8)×2.5
=3.2×2.5
=0.8×4×2.5
=0.8×(4×2.5)
=0.8×10
=8;
(3)2.5×(0.2÷0.4)-0.14
=2.5×0.5-0.14
=1.25-0.14
=1.11;
(4)76.8×5+76.8×4+76.8
=76.8×(5+4+1)
=76.8×10
=768.
=0.48÷0.8+5.6÷0.8
=0.6+7
=7.6;
(2)1.4×2.5+1.8×2.5
=(1.4+1.8)×2.5
=3.2×2.5
=0.8×4×2.5
=0.8×(4×2.5)
=0.8×10
=8;
(3)2.5×(0.2÷0.4)-0.14
=2.5×0.5-0.14
=1.25-0.14
=1.11;
(4)76.8×5+76.8×4+76.8
=76.8×(5+4+1)
=76.8×10
=768.
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