
直接写得数.4.5×10.1×2= 7.8+13.6+2.2= 7.25×1.3÷7.25= (4.2-0.17)×(2.1-2.1)= 300.3+30
直接写得数.4.5×10.1×2=7.8+13.6+2.2=7.25×1.3÷7.25=(4.2-0.17)×(2.1-2.1)=300.3+30.03+3.003=8....
直接写得数.4.5×10.1×2= 7.8+13.6+2.2= 7.25×1.3÷7.25= (4.2-0.17)×(2.1-2.1)= 300.3+30.03+3.003= 8.8×0.125=
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(1)4.5×10.1×2,
=4.5×2×10.1,
=9×10.1,
=90.9;
(2)7.8+13.6+2.2,
=7.8+2.2+13.6,
=10+13.6,
=23.6;
(3)7.25×1.3÷7.25,
=7.25÷7.25×1.3,
=1.3;
(4)(4.2-0.17)×(2.1-2.1),
=4.03×0,
=0;
(5)300.3+30.03+3.003,
=(300+0.3)+(30+0.03)+(3+0.003),
=(300+30+3)+(0.3+0.03+0.003),
=333+0.333,
=333.333;
(6)8.8×0.125,
=(8+0.8)×0.125,
=8×0.125+0.8×0.125,
=1+0.1,
=1.1.
=4.5×2×10.1,
=9×10.1,
=90.9;
(2)7.8+13.6+2.2,
=7.8+2.2+13.6,
=10+13.6,
=23.6;
(3)7.25×1.3÷7.25,
=7.25÷7.25×1.3,
=1.3;
(4)(4.2-0.17)×(2.1-2.1),
=4.03×0,
=0;
(5)300.3+30.03+3.003,
=(300+0.3)+(30+0.03)+(3+0.003),
=(300+30+3)+(0.3+0.03+0.003),
=333+0.333,
=333.333;
(6)8.8×0.125,
=(8+0.8)×0.125,
=8×0.125+0.8×0.125,
=1+0.1,
=1.1.
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