(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
(2)10.1-5.1÷1.7+1.44
=10.1-3+1.44
=7.1+1.44
=8.54
(3)设这个数为x,列方程:4x-15.6÷0.5=0.8
解答:4x- 31.2=0.8
4x=0.8+31.2=32
x=32÷4=8