1樓:我很無聊
(1)2.4×5.2×1.25,
=0.3×8×5.2×1.25,
=(0.3×5.2)×(1.25×8),
=1.56×10,
=15.6;
(2)(4.8×9.9+4.8×0.1)÷1.6,=4.8×(9.9+0.1)÷1.6,
=4.8×10÷1.6,
=48÷1.6,
=30;
(3)(3.2+18-4.04×5)÷0.2,=(3.2+18-20.2)÷0.2,
=(21.2-20.2)÷0.2,
=1÷0.2,
=5;(4)5.25×3.7+7.3×5.25-5.25,=5.25×(3.7+7.3-1),
=5.25×10,
=52.5.
脫式計算(能簡算的要簡算) 2.5×7.1×4 16.12×99+16.12 5.2×0.9+0.9×4.8 [113-(34.15+3
2樓:誒呀
(1)2.5×7.1×4,
=(2.5×4)×7.1,
=10×7.1,
=71;
(2)16.12×99+16.12,
=16.12×(99+1),
=16.12×100,
=1612;
(3)5.2×0.9+0.9×4.8,
=0.9×(5.2+4.8),
=0.9×10,
=9;(4)[113-(34.15+38.25)]÷2,=[113-72.4]÷2,
=40.6÷2,
=20.3;
(5)3.6÷(1.2+0.6)×0.5,=3.6÷1.8×0.5,
=2×0.5,
=1;(6)4.82÷0.25+1.25÷0.25,=4.82×4+1.25×4,
=19.28+5,
=24.28.
脫式計算,(能簡便的要簡便)3.82÷0.2-0.2×2.5,2.4×1.58+6.6×1.58+1.58,0.48×6.5+5.2×0.65
3樓:匿名使用者
3.82÷0.2-0.2×2.5
=38.2÷2-0.5=19.
1-0.5=18.62.
4×1.58+6.6×1.
58+1.58
=1.58x(2.4+6.
6+1)=1.58x10=15.80.
48×6.5+5.2×0.
65=4.8×0.65+5.
2×0.65
=(4.8+5.2)×0.
65=10×0.65=6.512.
4-12.4×0.25=12.
4×(1-0.25)=12.4×3/4=3.
1×3=9.3七分之五-(七分之五-二分之一)=5/7-5/7+1/2=1/20.125×9+1÷8
=9x1/8+1x1/8=(9+1)x1/8=5/4
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