(1)2.4÷4.8×1.05,
=0.5×1.05,
=0.525;
答:积是0.525;
(2)(10.1-5.1÷1.7)+1.44,
=(10.1-3)+1.44,
=7.1+1.44,
=8.54;
答:得8.54;
(3)设这个数为x,得:
4x-15.6÷0.5=0.8,
4x-31.2=0.8,
4x-31.2+31.2=0.8+31.2,
4x=32,
4x÷4=32÷4,
x=8;
答:这个数是8.
(1)2.4÷4.8×1.05,
=0.5×1.05,
=0.525;
答:积是0.525;
(2)(10.1-5.1÷1.7)+1.44,
=(10.1-3)+1.44,
=7.1+1.44,
=8.54;
答:得8.54;
(3)设这个数为x,得:
4x-15.6÷0.5=0.8,
4x-31.2=0.8,
4x-31.2+31.2=0.8+31.2,
4x=32,
4x÷4=32÷4,
x=8;
答:这个数是8.